Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf3778de0949b8b…

MALICIOUS

PDF

79.3 KB Created: 2021-05-11 20:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3b1a5dc67aa6e5a3c1833eb338fc1588 SHA-1: 22cbbb85e33b0d4df14937e9b9ca136544188cd1 SHA-256: bcf3778de0949b8be127ed6a0e6d5eb3577281ded49dc2568312715d531bdf4a
246 Risk Score

Malware Insights

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

The PDF contains a significant link farm, with many links pointing to disposable domains and redirectors, indicative of a phishing or scam campaign. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically flags an attempt to impersonate Apple, likely to steal credentials. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://finowizefi.weebly.com/uploads/1/3/1/3/131383614/8113427.pdf.
  • 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://jottigo.ru/strik?utm_term=farming+simulator+2015+money+cheat PDF link annotation
    • https://finowizefi.weebly.com/uploads/1/3/1/3/131383614/8113427.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/80497600583.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/cumulative_distribution_function_of_discrete_random_variable.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/3500162.pdfIn PDF document text
    • http://pixxel.life/macbeth_movie_with_english_subtitlesegrcb.pdfIn PDF document text
    • http://mmamba.ru/scientific_method_virtual_lab_activity_questions_answer_key9gvkg.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/buddhism_in_japan.pdfIn PDF document text
    • http://matrixbicycles.com/zudemibuvipan2vhps.pdfIn PDF document text
    • https://videtibap.weebly.com/uploads/1/3/2/6/132682663/nabeja-teradaretogulop-zeledivukol.pdfIn PDF document text
    • http://clientbluebadge.com/lopusumofekupunoxytie.pdfIn PDF document text
    • http://istra-backwater.ru/mipavaxaxovedowasidojufuykyft.pdfIn PDF document text
    • http://snegny.com/what_is_media_convergence_simple_definition6he88.pdfIn PDF document text
    • http://zoomita.fun/socratic_logic_peter_kreeft_odd_answersgr1va.pdfIn PDF document text
    • http://edapog.online/binizuvupitaganrqhlj.pdfIn PDF document text
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/kugasuke.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/rilifaneduweji.pdfIn PDF document text
    • http://rameautbxy.space/8134803079ac06l.pdfIn PDF document text
    • http://vwwv-avito.online/why_did_walmart_fail_in_germany9i3uz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_8d3b6e5c2ac2441fbe50d98b3ec70d2e.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_6624eaeeab5f463090fc5c547a124f0e.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_d51d2056f30946ddbdfb0351f21cf7e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47237730-08b5-4e47-aeb0-94c7ade7c092/bikisivimeranitedap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78313101-1dcf-423e-890e-b752ebe8dc98/goleman_leadership_styles_questionnaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422649b9-a8c6-498a-b954-5247243e3ed0/vonixirisidegesetopinukez.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_625e5a4d73234d9fbc1737a543be7910.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/wiperajot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1423877-b74d-46c1-9411-872be121b4ae/tadedinadefetipo.pdfIn PDF document text
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_e7a3f78c27924b6e948aa4ba45cf71e7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 5720 bytes
SHA-256: 6cbca808e878f4c871e5ea1932f3073d10df4e5d187793dd247bd2c391890737
font_01_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 10288 bytes
SHA-256: 258a6ce81e363a7ab92085154c7b7aea436b4fe454dadbdaf58e672ca942f821