Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2ce8f7e9657762…

MALICIOUS

PDF

71.3 KB Created: 2021-01-05 01:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 85c43d6cda4851eec13394d5009657ef SHA-1: 94c24c2267eb179e06a39aefb0392dad5cf7babc SHA-256: 6e2ce8f7e965776215de57c9bf7604affd424c9dd4a5648f1373a951b1092a1e
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to redirectors, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a high likelihood of malicious intent, specifically a free-download phishing scheme. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?utm_term=cset+math+subtest+1+study+guide PDF link annotation
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/69e3da9f02e8e.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/P7agfYc/managing_oneself_harvard_business_review_classics.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/LY4igS0/38614382076.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/jfjeaPZ/street_dunk_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/8NSJVha/66742363377.pdfIn PDF document text
    • https://sezosuxinowa.weebly.com/uploads/1/3/4/2/134266263/sexeje-xapejoxifiziri-futokep-wivumalawe.pdfIn PDF document text
    • https://lopinelu.weebly.com/uploads/1/3/4/3/134369173/puxategugejifelos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tizowodifi/78387271950.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/lease_agreement_template_north_carolina.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/jinuzisejiv.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bhoy_dekhas_na_please_song.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/lutivixoxetubadan.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/hungry_shark_evolution_hack_apk_for_ios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 5096 bytes
SHA-256: 1b29708cd479e7ca477dc2bf8c246675c10ae3384154784ec6cf985e9b44b273
font_01_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 10884 bytes
SHA-256: c96befef05364e52b623f97a8bc925df5b330f4b52fa3a2aa6afb828fa2fe33c
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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