Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f009ba0813b31…

MALICIOUS

PDF

84.1 KB Created: 2021-04-18 05:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 72443cbdd4e4bf1daa858ecaaddb1a01 SHA-1: fc94c28b00d931739124368247d159a54eb868e6 SHA-256: 5a3f009ba0813b31d97675c45af13ed7bc2d78aac30864b10241f8ff9016886b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL `https://yafferge.ru/strik?utm_term=dell+inspiron+one+2320+specifications` is a primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=dell+inspiron+one+2320+specifications In PDF document text
    • http://razixir.22web.org/86810972803.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/astral_pipe_price_list_2020.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/noxozavofufuxidafajelo.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/nipetivedexepedelafode.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/gonit.pdfIn PDF document text
    • http://wuruvuguje.22web.org/rafejasoda.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/4246609.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/lawn_genie_lawn_dial_instructions.pdfIn PDF document text
    • https://guridawado.weebly.com/uploads/1/3/4/5/134578433/3636035.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/a05c74c895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazawojob/rv_awning_replacement_fabric_17.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/78484901230.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/tuxizipunilupinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4118dbdb-e03d-4ae3-84e1-22c0510f8dc3/xukamudosov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34157c4f-df72-4755-aca3-1f23ff0113f7/what_is_the_hunger_games_3_about.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_beed61a904584b0fbd3838f736a723bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/67969577554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0087bd-af7a-44f3-9063-7cb5637c0b7c/31676360919.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/whatsapp_update_2019_for_pc.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/graco_magnum_x7_replacement_parts.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_00af72c2d02141e2a6881ee7bf0d11a5.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_e26b343d76ad41d791df81f7c9a05e10.pdf?index=trueIn PDF document text
    • http://lagunuriteg.rf.gd/espirometria_valores_normales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfafb16-0853-4752-9247-77c217f81954/rubolitonumewemexigabozor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2461a9-9a7c-4158-be44-25a6df7c9444/10063252142.pdfIn PDF document text
    • http://dovagoxaluzof.rf.gd/3d_photoshop_cs6_software_free.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_2cb9987114814342a40d3459d94e2652.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/geometric_distribution_exponential_form.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5236 bytes
SHA-256: c5a6d0b4709a4b2c815f861397b06e9c615a7133c4ef778e4791d07e1299a7cb
font_01_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 10688 bytes
SHA-256: 35383ff2f30fea2c796ac6e32935ac641996f044a0b0097f106afbe3c3757db3
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16336 bytes
SHA-256: 0308b7e45e533fc36ed14bb91612a819bec8fedd6a77b969bc726590389af327
font_03_sfnt_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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