Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5e34e114eb925f…

MALICIOUS

PDF

81.3 KB Created: 2021-05-16 10:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 790a4a0d7cc4ab4b8500ac167f6d5335 SHA-1: b2586138341579f2a3d179d602545e5dab9bda61 SHA-256: 6b5e34e114eb925f60e2fd20b84a90095454ebe9bcbfb756d3b7be46f2a06d86
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+to+write+structure+in+english PDF link annotation
    • http://forexgeeks.net/how_to_light_a_tappan_gas_ovenk5o4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_602f56e43cf12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_601980dcc4b39.pdfIn PDF document text
    • http://tipepusevuw.iblogger.org/wudederuvesoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6014d0b5449c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_603fa38bcd6bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5ff50d945caab.pdfIn PDF document text
    • http://repair-planshetov.ru/742143004330pkj2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunupilopun.epizy.com/52856503622.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_e4f0936b52184bcc9b07a102aff20429.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_2ebb55cb3cc340d4987ca6a5ac958af8.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_e678ce20fdf8441d9179a3a697f1a5ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/game_minecraft_gratis_untuk_android.pdfIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_e1aefc247e81409592c4cfcd9bd15706.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_f8e25053b8a24e1c948c4db1d7a770e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/declaration_of_independence_summary_worksheet_answers.pdfIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_d6256ef9d09d492fbff1990566f566b3.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_cd0e913d9fe143168aedbb0b7ee9026a.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_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 4904 bytes
SHA-256: 4bc464096b307403bd54fb4fb526c66e33d204c0ae1879b08857492e23964955
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 10568 bytes
SHA-256: da723f1c2257f2ef4395a40756facaa57d2712731433ad5de3cdd2fe8205570f

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