Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd875b2151b633a1…

MALICIOUS

PDF

66.5 KB Created: 2020-11-13 23:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e1765edf22bf3741c3567d61162b8c0 SHA-1: 7c36cd47493483d15cf665bed4937b097365e7fd SHA-256: fd875b2151b633a11b2c871238df745d7ecc0690be958c09a5af401be7fd7681
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The primary URL, 'https://traffking.ru/123?utm_term=fundamentals+of+biochemistry+lehninger+pdf', suggests a lure to download a document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=fundamentals+of+biochemistry+lehninger+pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdf
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/980511.pdf
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/jotomuzawa.pdf
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/potiru.pdf
    • https://mazesuxuraname.weebly.com/uploads/1/3/4/3/134373945/6469250.pdf
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/wagebupesebitupifigu.pdf
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/mezerobusifof.pdf
    • https://sipelebe.weebly.com/uploads/1/3/4/3/134312525/vorugokireda_wusejorija_gusufivid_miziwuzesawab.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/jeziwaradovagu.pdf
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f97490123c5c.pdf
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fad3cf59a018.pdf
    • https://wubabenababi.weebly.com/uploads/1/3/4/4/134432193/f9210cab7e60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vipuxafol/wumakiwovuvuvesenuzawaror.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_off0000c7ca.bin
a4289ea1cc6291e7956a0f7c36b1240e2867686aee9b7d6abeef142af15c19ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 5764 bytes
font_01_sfnt_off0000db46.bin
9f5354462d6d1a7d37accc66507e647b6eaaf1ea52a190d2b66c4282d2e81fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 9900 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.