Malicious PDF — malware analysis report

Static analysis result for SHA-256 441f9b9cec347b9c…

MALICIOUS

PDF

73.2 KB Created: 2021-03-31 02:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b58b9912113ec5500e968ed83b8f7fd0 SHA-1: 1c14fd108b876a56566dad7f455ad50edae051de SHA-256: 441f9b9cec347b9c8f29a73b038266edb9c7e3f64d1dc914d1ee6970709b6d0c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://kuzutuzo.ru/wix?keyword=xsport+fitness+class+schedule+alexandria PDF link annotation
    • https://cdn.sqhk.co/dofofigeniso/HjfMYtQ/can_you_transfer_cash_app_money_to_bank.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/hegfppk/my_t_mobile_account_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_601ee002b00f3.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/aJghgcb/hey_clay_birds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5feb16f6e1554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_6052fcd066583.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/bhdhfTJ/lunijedobanuluv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcfa330eac38.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/25703503019.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/90398462699.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/yongnuo_yn-568ex_ii_nikon_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://migotebixum.rf.gd/blackmart_apk_for_android_nougat.pdfIn PDF document text
    • http://radisabuvaba.epizy.com/keyboard_shortcut_excel_change_sheet.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_4f00ea2db45a47e8bfda700b5f1e2c47.pdf?index=trueIn PDF document text
    • http://kibagog.onlinewebshop.net/makepolitulofatesulotujug.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_580be3be4aaf48c7b3ad4c2c8e98cb2a.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_4591f8f330f4445b80f056495e2a6aee.pdf?index=trueIn PDF document text
    • http://zetinemimofoti.epizy.com/62823881299.pdfIn PDF document text
    • http://lorojol.rf.gd/thailand_detailed_map.pdfIn PDF document text
    • http://zopimubusa.rf.gd/iima_casebook.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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 5288 bytes
SHA-256: 6949098bba911f7d09f61993f629e82a320a24c9a31928d091e815f0c29c19b8
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10808 bytes
SHA-256: 25c030c609da1673a709c68a3bd3953e6ec7db732dc60b86957e1792042b1744