Malicious PDF — malware analysis report

Static analysis result for SHA-256 483f39ec2e7d974d…

MALICIOUS

PDF

66.9 KB Created: 2020-11-14 04:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a266b45d8b8bfa22d07cf5e0e97032a1 SHA-1: 27565fa7c221e776800191351018c24d6421f852 SHA-256: 483f39ec2e7d974d627c46dcbffc00a2faa84f9d9a2778041e4dbee6ec662361
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-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://trafffi.ru/123?utm_term=electron+subshells+in+order+of+increasing+energy PDF link annotation
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/sopinedujuvemevago.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/rabaxabatire.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/gurelutujerun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f94efd6e4489.pdfIn PDF document text
    • https://jerimokini.weebly.com/uploads/1/3/4/4/134484757/lobudojufa_sedakudaluv_vibowur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f8f68c84f110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_5f9f3c5460ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5fa42c510fc9a.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/kitakilesa/vunebituwafuwox.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/johannes_kepler_astronomia_nova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a49754-3c63-45d7-9d27-15930de23a54/student_connect_ccms_union_city.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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 5480 bytes
SHA-256: d416d11dad7700a1824f0fe968694f1ff49bda9a7b90fa68a6c6e9d65c907632
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10896 bytes
SHA-256: 6c2b3a1e4252c36c2857e49b1e3e134625e1d5fdddf6d6e1b84edd58d408c72e

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