Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e16abf1527c9ba7…

MALICIOUS

PDF

96.4 KB Created: 2021-04-06 15:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4876dd152ec270e8fcfe14957b156f91 SHA-1: 20c1d4b40005a70b619523314180737dfb03cf1e SHA-256: 3e16abf1527c9ba7e145082ae9567c88a2ac034b366b051dcaf438485d63bc23
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a UTM parameter in one URL indicates an attempt to track user engagement with phishing lures, likely related to popular product drops.

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=walmart+ps5+drop+schedule PDF link annotation
    • http://sexaxagorotire.iblogger.org/statistical_analysis_with_r_for_dummies_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karadefega.epizy.com/drums_of_autumn.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_96b94d19fbcb42459111eb6a453e9258.pdf?index=trueIn PDF document text
    • http://tinasixubu.epizy.com/jujusafivinuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/ultimate_shred_stack_steel_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/veiled_chameleon_diet_sheet.pdfIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_c6840909eef943119c8926d429cc29ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a10d3b-c8fb-4ef6-a835-3f7a4c455244/vobodugatujexuzo.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_781d50bd9c064ea58b3168e209824489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e64be09-69d6-4cf3-b448-4aaac321c64b/9468456850.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_54d1fbf06df5408482dee536306b3aaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/vuvedolotevuzosotin.pdfIn PDF document text
    • http://ribojar.rf.gd/blood_type_o_diet_chart.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_b14ac0e3883e4034853ae189a50b6069.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_e77683abae034ed9933da9276b60cc1b.pdf?index=trueIn PDF document text
    • http://durunorutap.epizy.com/fond_du_lac_reporter_archives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ce302b-b4cf-42b8-a4b6-44c4e2268b58/my_hp_deskjet_3054_is_printing_blank_pages.pdfIn PDF document text
    • http://wekaniloba.rf.gd/92402543434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ee948a-8e7d-44fa-b809-7a3ff4ef15f7/quadratic_equation_calculator_with_vertex_and_y_intercept.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_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 5452 bytes
SHA-256: fcc828b6d7b0b85f9528636a8ed96d11142b66969da5f1ad6715dbd4c0b5a4e0
font_01_sfnt_off00014b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B26 12132 bytes
SHA-256: f17dc115f2af7f82dc42b84629368a98ce60704a915c5036dddcf250eb9a0bf6