Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c3c449ed822c17…

MALICIOUS

PDF

80.6 KB Created: 2021-04-03 07:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 74eab893add84b63f56f20cd67718963 SHA-1: c918bde4328f175149508a182ab0b013e603d258 SHA-256: 90c3c449ed822c17369ffa24b57be5a98f4ae230fc7d0d484632b7ff0ee5670e
194 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 attract traffic or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_LINK_FARM' heuristic point towards a malicious redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=avr+assembly+language+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/vatuliwa/bghibjf/40639997133.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/gdEhbid/clawbert_toytown_spell_words.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/427189.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/e4012afef67a6.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/hIWufjj/best_free_slots_game_app_for_android.pdfIn PDF document text
    • https://ferovagadimi.weebly.com/uploads/1/3/2/6/132696304/kurisefimaxa-guvodavo-julodavixojaxaj-puxilor.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/be85fa984ad6.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/rizirokikimidisu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ejihaFr/30006693957.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/tiboxafa.pdfIn PDF document text
    • https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/wojogom_jaxafakobot.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/pebofare.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/jcA8MTK/chess_rush_pc_gameloop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_847e237d4acb42c0832a382112d6bd50.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_b44782ea160945e28c5b3ba32a50eff4.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 5652 bytes
SHA-256: 4efcfd0b869eecdd2bec3a0855218452d2172d37a4c08b8f93196b75bdbd8f19
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 11360 bytes
SHA-256: 012ef0d55e598bfb0844d77db6296df89d8bf629c4f548a34ec2868899ea69f7

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