Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88611579775e8f8…

MALICIOUS

PDF

66.9 KB Created: 2020-11-09 18:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e990bcd0b71df251aea610bb31ba976b SHA-1: ef6681f016b0592b261d55cff6b81fb05509ec99 SHA-256: c88611579775e8f8394a071bdf578978652a351b0cd54542cb16a1e7cfaf522c
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://traffset.ru/aws?keyword=summary+on+blue+collar+brilliance+mike+rose PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8940116feef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_5fa3d87dc6e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f9a277a3180a.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/pudaposir_rezavajazev_kadagubewetake_kewetugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f8c8051a0414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_5fa39faed9e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f8aae3ccd40a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5f9a211b93c90.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/loduf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/algebra_1_volume_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/bribery_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/28777962925.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/31969363205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acba9c3-7f9b-4fd0-b253-428f15d262ec/58541319562.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 5352 bytes
SHA-256: 1e8d7c46a33f601053944601893fdfc3f41f21dcdfda909034ff206c62289db7
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 10296 bytes
SHA-256: a8c012ed03213670cf157069122a4d73175e6181c094f4ce13a0d69b145e5e46

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