Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a9b32e2c4bdd5f…

MALICIOUS

PDF

73.0 KB Created: 2021-05-27 23:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9dc162ab99f575780d80cf843b37629 SHA-1: 55bb03f57ad0ce1693538783cd268f005f348d6c SHA-256: 86a9b32e2c4bdd5f5075d2373782121235e9e9be9c254a862cbecb41da72b0f7
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/123?utm_term=endocarditis+guidelines+2017 PDF link annotation
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/remolavomojezap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_600e3e3c5dd79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_6004004754f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_60520b071f2c7.pdfIn PDF document text
    • https://wuwixebesa.weebly.com/uploads/1/3/4/5/134506807/ligoloreno_mevekubazag_poveris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_606dbff2dfce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_606478994e2e3.pdfIn PDF document text
    • https://tivofemexire.weebly.com/uploads/1/3/4/0/134012880/c0618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6027f5e40c1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_602ea33a14089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_60610cb60ef31.pdfIn PDF document text
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/3660190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fe554fb71603.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/7107069.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee0fd27-df88-4005-a575-49887fa544b0/tezerox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a498d77c-c67e-49f5-b0ca-3ebf13808848/fue_un_beso_tonto_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366615b7-97cc-485c-a2a2-51abedda0e21/bubble_test_answer_sheet_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da0dbe0-73a5-442e-b882-eb0f8eaa2650/quotes_about_the_measure_of_a_man_is_not.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 5468 bytes
SHA-256: 72b4a56735c0418fca48574f7fd3387c9744b99fb17119931133427cf6f26bfb
font_01_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 10332 bytes
SHA-256: 17fe8f6bd5fb9ce083374cfd72e8f08588930602c6e45b7b4f7641de13618e32

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