Malicious PDF — malware analysis report

Static analysis result for SHA-256 e127aa356f7129b7…

MALICIOUS

PDF

82.2 KB Created: 2021-03-28 19:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b8e3c4468c6cb961b2f4e6880d9a3f69 SHA-1: 308d8b9d91cde8bb987fa20b13a1acf203d19c09 SHA-256: e127aa356f7129b75d47d3124882af49e1c28e3f0009ad872486ae978c676322
226 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various external PDF files, with the primary URL suggesting a lure for an advance-fee scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads. No scripts were extracted, but the structure and embedded URLs point to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://seumenha.ru/award?keyword=system+administrator+duties+and+responsibilities+pdf PDF link annotation
    • https://cdn.sqhk.co/pabefidinaz/tmUztij/87885651527.pdfIn PDF document text
    • http://lemumelubijene.iblogger.org/59521411696.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/Rhihchh/nedaradajovotesox.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/lVidTjd/4618727894.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/icifja6/american_sniper_movie_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/RifjcEQ/6830190223.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/Dhjejgp/advance_auto_parts_near_me_open_now.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/botitetulinukuxutivuveve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://walugiguzav.epizy.com/sat_writing_score_scale.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_4030b190810d48e5be2b5f988437ca7d.pdf?index=trueIn PDF document text
    • http://dupetomumipur.rf.gd/comparison_of_adjectives_worksheet_for_grade_1.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_4366654f88a8487094d2148af2f9f47c.pdf?index=trueIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/53638135378.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_bebd679440794db98645dd261518d34c.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_2e5f4606ab814d50854147f5cf15edde.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_96d07ee894384fe990b7f7bd9d341f52.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_6836bd60c25a4c4cbe34be32387b4540.pdf?index=trueIn PDF document text
    • http://zojiwedut.rf.gd/43144445002.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_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 5532 bytes
SHA-256: d09c5e3843d6a92f15a31aadb4bfa026e552159297513351bb1d80f277311a27
font_01_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 10552 bytes
SHA-256: 2bb821949f91b4dc5680ab91e74c29d89b1f2d5ddab2432c6568f5b8e695c5c1