Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d8b83c622e5c7e…

MALICIOUS

PDF

67.8 KB Created: 2020-11-19 05:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a8adb8fd545688df9bbecd73725d2599 SHA-1: b8347bdf299cc6ad7ae286b19f73969d02d27c95 SHA-256: 91d8b83c622e5c7e9db81749ab5cc65ea8674b24b0571fab774916933917ab63
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 0.9997

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://traffine.ru/strik?utm_term=hunt+showdown+controls PDF link annotation
    • https://lajojadarexod.weebly.com/uploads/1/3/4/5/134506383/8009337.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/5e8d256f2b.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/lejorefeb.pdfIn PDF document text
    • https://dudabiwik.weebly.com/uploads/1/3/4/3/134354119/kabogoka.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/sozafanimitu_lepebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5fa6b688e3784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_5f9a159c9e7e7.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/5a5f42fd-dac2-4a0c-914a-21f3e8a268d4/pevufudesajafabitem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f094c236-ed55-4d70-b590-5f680979ee2f/23985774600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e36aab-2357-4580-bac7-0907e0646e0e/newanineluliravivesufafed.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/full_form_of_computer_subject.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c525450-17fb-465d-9b0d-e3b1f021f2c7/56316100718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7eaf9f-9983-480d-8a8c-173db9f00746/21845233870.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_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 4868 bytes
SHA-256: a18753c273523203e05419af0851ead773a68a74c4c750ee7542005217c2439b
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 10584 bytes
SHA-256: 1fb83a58ffb82d31190abc002ca47f7de8ae48535da02194818db703a00fbf50

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