Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fbbacc8facaa31…

MALICIOUS

PDF

83.7 KB Created: 2021-03-09 00:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01d9b31897d8780bab9a802ffaa39433 SHA-1: ac8276a2a7d7a298ad08197915cadc20dcbc45f1 SHA-256: 71fbbacc8facaa316a8f57fee7824a652030bb9bcd22e1dcdd060bf9ef1b4dd4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external links, forming a link farm, with the primary URL being https://resalured.ru/award?keyword=arithmetic+geometric+harmonic+sequence+pdf. This suggests the document is designed to redirect users to potentially malicious or spam-related content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/award?keyword=arithmetic+geometric+harmonic+sequence+pdf PDF link annotation
    • http://naturazuwedemoz.22web.org/22594272756.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/ibLT8Oq/color_jump_online.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/Sghihih/susumapepunipiteliw.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/49e99624a278e.pdfIn PDF document text
    • https://jevefelenop.weebly.com/uploads/1/3/0/7/130775498/c9ce52cb098def7.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/MBB7iig/89925831752.pdfIn PDF document text
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/2411086.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/jhhe1Nb/numujekal.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/PhhVOic/petis.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/eKigagd/the_forest_hard_survival_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/hajifgf/jivodonekaborujumelutepum.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/446fd36e30f5fa6.pdfIn PDF document text
    • https://julovupepopa.weebly.com/uploads/1/3/4/5/134522834/logozukadewijanusado.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://uploads.strikinglycdn.com/files/9b5221ae-426c-4fe6-bda9-272532a5bf37/zipazosoxuke.pdfIn PDF document text
    • http://rolodumom.epizy.com/displaying_statistical_data_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7647b3-77ee-4f0a-8444-2c353c22741a/pekikaligelapuli.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_6c0252a2030f4e1c9e1674fd398f11dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/614d8542-8f57-4ba3-a200-2a66d0848ff1/where_does_word_math_come_from.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_acf6ae40819d4f038c8040c721830319.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_17c8bc08517b4dbfb28a6b0f2aef770d.pdf?index=trueIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_98dcc5f3df33416b8c1d7c7c944542dc.pdf?index=trueIn PDF document text
    • http://wesokukukidi.epizy.com/progressive_web_app_template_github.pdfIn PDF document text
    • http://pibanexotobove.rf.gd/english_high_frequency_word_list_with_meanings.pdfIn PDF document text
    • http://xekujigifur.epizy.com/31376928522.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_f26ecd85ba394fc390b6cd19fa2f5d85.pdf?index=trueIn 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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 5536 bytes
SHA-256: f79dbf79b318f2810de3a982bf2bf452d0b484f4364d30226e482b63e9879c4a
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 11072 bytes
SHA-256: 645074b022a89ecd8210de2dd726ec74545dc522a269b29f77d7b3682a8e2ede
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16136 bytes
SHA-256: 0f2f5300e9987fe257c9b8ad227c131044fe1a1afcc7c44de3e409c70e5f6344
font_03_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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