Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6178a8ab2a6b73…

MALICIOUS

PDF

88.8 KB Created: 2020-11-18 07:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c5fa7e4037bc1750ffebd3b6f3d494f3 SHA-1: 9227ee7b6790885efb81ad784a891ce0173f6161 SHA-256: be6178a8ab2a6b736dcc460a846593ef5deace35a6f0e9ce08f3d5da205502f3
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 0.9997

Heuristics 5

  • 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.
  • 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=class+1-b+seating+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5fa2e85cd5e55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_5fb290fca006c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fb2bde96b30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5f91382fd530d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_5fa9a69e20c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5f9f349ee3c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f9009bdbb533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f8d0ed38fa68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fa4ead990dac.pdfIn PDF document text
    • https://goxezojukaruvuk.weebly.com/uploads/1/3/4/0/134000107/701fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f8daa94163c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_5faf775bc27f9.pdfIn PDF document text
    • https://sotemukolewidiv.weebly.com/uploads/1/3/4/6/134660154/4338041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5fad456bb440d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5fa32fc6aa3df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 4736 bytes
SHA-256: a880b2b5b0b26b3a87d68345c00843f2bb3efdb845d60e78e94b5d585e8a772b
font_01_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 5188 bytes
SHA-256: 6b89a5345553994973e03499181bf51775c0fd033139993dc2e61bf1d7a68aa0
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 11100 bytes
SHA-256: 311a647960c452692bfd01970b8302fee6c530dd38f520d5c4f055d24a61a58e

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