Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1eb562647f6b08…

MALICIOUS

PDF

93.1 KB Created: 2021-04-06 19:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5da66a649687e350bb035ed6b27d7d39 SHA-1: 295af44e1a9aa261eae48fd14c66b0f2aba33c3a SHA-256: fc1eb562647f6b0849ea74909d2f8109093ae6580e6f7aaf5a89a0cac038427a
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of link farms, directing users to potentially malicious or phishing websites. The heuristic firings indicate a deliberate attempt to create a link farm, with one URL specifically identified as a redirector to known malicious infrastructure. While no scripts were extracted, the document's structure and embedded URLs strongly suggest a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=what+is+meant+by+the+word+human+condition In PDF document text
    • http://kopogaxepaku.sportsontheweb.net/mathematics_required_for_machine_learning.pdfIn PDF document text
    • http://stnold.com/20303428603tbsf1.pdfIn PDF document text
    • http://exampl1214.com/david_s_bridal_wedding_gown_rentalsgy8b0.pdfIn PDF document text
    • http://twirlini.com/centerpoint_4x32_scope_focusfuy12.pdfIn PDF document text
    • http://domavera.ru/what_literature_means_to_me_essaya8ydc.pdfIn PDF document text
    • http://creditactive.info/davixodojujibumi5sfn5.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/reduccion_de_costos_definicion.pdfIn PDF document text
    • http://finansi-7.online/how_long_do_you_cook_jasmine_rice_in_a_pressure_cookerf13z3.pdfIn PDF document text
    • http://mon-cmb.best/doxezijiboduzesey68h.pdfIn PDF document text
    • http://creditreportfast.info/the_anatomy_of_melancholy_downloadyvn4i.pdfIn PDF document text
    • http://creditactive.info/how_to_update_ti_89_titaniumzn97c.pdfIn PDF document text
    • http://wersita.fun/cisco_ccnp_exam_discount_voucher02cz9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibubatovavav.atwebpages.com/english_aptitude_test_with_answer.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_9c150d980f8b4b7c8774e41b647c1cfb.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_fbec7d63d95742f5b51e1f93e8258d6f.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_be21b13b9a3a48cd8dd1d709ef0e4ebc.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_70d515c74c704c59b25f9e5b99e96e91.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_d1b377195d9e431f898d6ca443d91662.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_70388d4233564d5aa54070dfa6224433.pdf?index=trueIn PDF document text
    • http://zevusup.atwebpages.com/divefosamuwerelabefapeg.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/71736191843.pdfIn PDF document text
    • http://lekipuvuji.epizy.com/kereguvizamilej.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_4f64149d1a1d4d8db6c82104cbfa8f4f.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_02b5b6bfeb544fbc9c884624adb85242.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/48266002844.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 5496 bytes
SHA-256: d8d033a189b1f3dd3da781821bf3cab4bd3392b8a6f4cb4a8f796e92e757ec1b
font_01_sfnt_off00014124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14124 10916 bytes
SHA-256: e4199716a5fd093766465360cb28ad015dbefad755fb0f259e698511fbcdfdf1

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