Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd6afd8227d883…

MALICIOUS

PDF

60.8 KB Created: 2020-12-18 06:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b083787eaae890c8af5a38ca482ff5a2 SHA-1: 29431f6f1c93bf64290e0bbbb9da608aa47ab247 SHA-256: 90bd6afd8227d883e213de41691b04d1bdf7a4716966a00f432adad1d2783f93
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=origami+animals+pdf+free+download
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/9981234.pdf
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/labolalawezita_pubevidame_golovul.pdf
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fd93db92143b.pdf
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/b57fb365.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/a0171d1e9c0.pdf
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/f9d05c4a3faf043.pdf
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/nuxeduje-demananabir-turisolexivipo-firitukumar.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/binibesamejo.pdf
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/8100f68c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sigobija/jediz.pdf
    • https://uploads.strikinglycdn.com/files/39d79e1e-b4c2-4020-8df4-ba83e4f51c36/pilaten_black_head_ex_pore_strip_instructions.pdf
    • https://s3.amazonaws.com/vavebufevodutob/one_piece_anime_manga_guide.pdf
    • https://uploads.strikinglycdn.com/files/b45397be-1067-4ce9-ad84-8ab359060a5e/statute_of_secrecy_fanfic.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_off0000b21f.bin
d5d5f0e2ab4c490b1f8c053535f0722f2e85d423653931b4f2423b7797cc0092
pdf-font-stream PDF embedded font (sfnt) at offset 0xB21F 5480 bytes
font_01_sfnt_off0000c4bd.bin
6cafea331a2f73293cce5402b6a78a4724614057f1e60b77fcd69bcc0384306c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 9860 bytes