Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2c65e17cee4a7f…

MALICIOUS

PDF

73.0 KB Created: 2020-11-14 03:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 80cb754555a549fb71afc763ccec74e0 SHA-1: de775b1b41787d6b34e05f56b9eb3eb20dc94bb5 SHA-256: 2a2c65e17cee4a7fc22b18a40241101f4522d71ce464abdc1c62c68239d20246
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://traffking.ru/strik?utm_term=moo+a+novel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f96b6a0c1c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5faf2a7f6d367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f98846baa95d.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/6cd596d081d5ca.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/6843936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8ecf6927b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f98dd7820dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f8bb47d30e92.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3af0492767d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5f91e6e5cddf1.pdfIn PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/nawaruwinapefob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5faf068a3583a.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/ae6bf40f-d3b2-49fc-916a-ae14849b1a34/games_for_bears_unblocked.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 4468 bytes
SHA-256: 22830e03c6658b12278475ec04e7f31514c3f3b0028cb5631fb124e7046e75c3
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10592 bytes
SHA-256: 05fbac4178936a982cc7d646841e3d077f9f0c6975070150a03b3f1fcf8397a5
font_02_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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