Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7fb097eafc22f6…

MALICIOUS

PDF

66.9 KB Created: 2020-12-23 19:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba2df09fa558bd8e5c5458e5676e9bd9 SHA-1: 77f7fcb23249fcae192d3070a76bb486c1f4878a SHA-256: 3b7fb097eafc22f64f1f17157fa6c7a254946a36cb6f4c2be08630d83fa9f972
156 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/aws?utm_term=amazing+grace+clarinet+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5fa63ce632285.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/9bb2b896.pdfIn PDF document text
    • https://wopaxosidavi.weebly.com/uploads/1/3/4/7/134732603/majofexabozanafidit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_5fab3964a962f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd2699a15a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f9cae763b0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5fbc2413b2b3f.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/f7a39a70-6d87-4987-b72f-01de3307851a/kimivimafiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5728613-a4ba-4c95-94d0-f7c9000cf7c4/wivoxazimitusifedapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a699c08-912f-4b22-936e-f2f44e9dbd98/solfege_worksheet_5_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1642597-41fc-4b72-a247-fa213500fdb7/9805328789.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/mastin_tibetano_precio_bogota.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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 5608 bytes
SHA-256: a417cac89c1b010f4d5479e3962c84e8aa5998d1f3f4c8565900d16dea8deddb
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 10320 bytes
SHA-256: 8b8515fd61efa4086e559be1e0a4f1796cd627c46529ce0e98823d8face15ff7

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