Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec812501734839c9…

MALICIOUS

PDF

73.6 KB Created: 2021-03-21 22:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b8bc1494cb7ba10e8da925e83f1d9c SHA-1: bc7545e57e7f63ed54f8d7a142792cc37310aff5 SHA-256: ec812501734839c964c7f084bceb6bb2ca27790a02178c77595d92072c7271e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a large link farm. The primary URL suggests a lure related to a D&D character sheet, likely to disguise the malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malicious content delivery mechanism, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=d+d+3.+5+revised+character+sheet+pdf
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/cd730817b06bfd6.pdf
    • https://cdn.sqhk.co/luzigagoguna/cMjcacC/pofokasa.pdf
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fc80dafd4bfb.pdf
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fe2167d2de26.pdf
    • https://cdn.sqhk.co/fopeziriga/Hfjalia/fancy_pants_adventure_3_unblocked_weebly.pdf
    • https://cdn.sqhk.co/duromivap/eigBgdb/71530810938.pdf
    • https://cdn-cms.f-static.net/uploads/4417818/normal_604739fdaffcc.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fdb027a370ca.pdf
    • https://cdn-cms.f-static.net/uploads/4490244/normal_600e4bdd4448c.pdf
    • https://nokidevekixim.weebly.com/uploads/1/3/2/3/132302759/rulironuzi.pdf
    • https://static.s123-cdn-static.com/uploads/4476566/normal_6000ebbe40524.pdf
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/803583a41.pdf
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6040a008754ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wolina/33216722992.pdf
    • https://s3.amazonaws.com/juvosi/after_submitting_form_redirect_page_in_php.pdf
    • https://s3.amazonaws.com/novifamigot/new_moon_december_2020_meaning_astrology.pdf
    • https://s3.amazonaws.com/fajixe/wukenepelavarikakim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin
458c38daefdba8ca86b5212da8f0cdcf1c2ef7562a81b266737631068d25ae7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 5592 bytes
font_01_sfnt_off0000f4f8.bin
91ddabb21474386a9d639b02dccb8a1cb26f7559708f3d117a12e97bf6e9c1fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10712 bytes