Malicious PDF — malware analysis report

Static analysis result for SHA-256 d877b30c5b041899…

MALICIOUS

PDF

58.4 KB Created: 2020-11-18 03:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1bcb5deb50ac0748ce2963fd9a88eb84 SHA-1: 2d4a079d3216d044899bd67733c517c213ccb2e7 SHA-256: d877b30c5b0418997d0bd02a257c7d0f58d69e81585bc2760458f2a0425254df
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 0.9996

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://traffset.ru/123?utm_term=code+silver+st+joseph+hospital PDF link annotation
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/fedoteru-muzop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f88f6e09922f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5f8b7806027b7.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/b713ccb.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/5bb68ce6943b7.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/3724686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f883bc8da7df.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/kulupegobewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f88cf03d15c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_5f929af687535.pdfIn PDF document text
    • https://zatetemaf.weebly.com/uploads/1/3/4/4/134494585/wigovanokavon.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/652063.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/82f3b36a-2a9e-4215-bbdb-4167090af23d/dividing_polynomials_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d22040-b380-46fd-a602-c19361b6ec61/warshaper_build_3._5.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_off0000ad7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7C 5088 bytes
SHA-256: d681d280ec4f605311bc404c08a94f646f36f3d48a0dd5d0e77089c6a2d8a6c8
font_01_sfnt_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 8856 bytes
SHA-256: ac6d6b90e8608420da6ff546057b9413db0a23447a62fd9e17e45ee14f1ba6bf

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