Malicious PDF — malware analysis report

Static analysis result for SHA-256 7637ea989a8a5adb…

MALICIOUS

PDF

83.9 KB Created: 2021-03-20 19:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cdfbbe285b609f168b8ab851d11e8981 SHA-1: 2366daa347f76798710bad92b5fe7c8de284aac9 SHA-256: 7637ea989a8a5adbaefb5c4a072fb9fa51bc9845dc2a729c2ea9aa682d9fb289
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/award?keyword=company+profile+pdf+examples PDF link annotation
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/nifopawilesas_rijewalok.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/bitijovomadowokoziwa.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/restrictive_cardiomyopathy_guidelines.pdfIn PDF document text
    • https://xekurisiwa.weebly.com/uploads/1/3/4/4/134401096/fozubexilejirilemik.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/tazasu-sujofopudagaw-vijomadim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_60404b8f4a25b.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/how_do_you_use_essick_air_humidifier_bacteriostatic_treatment.pdfIn PDF document text
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/40daba10c2.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hjcicgi/klassroom_application_ipad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_5fe5586658ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_600c7e1b45c7f.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/tunumavesofakuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refaruzevogot.epizy.com/rokabojamowepoba.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/siwekelaw.pdfIn PDF document text
    • http://meridupomosim.epizy.com/47343727035.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 5260 bytes
SHA-256: 440e23a6436d2bf706d90e3505477f0b9340c1fb1cfbda25bc42e5250503c93f
font_01_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 12196 bytes
SHA-256: ab55f6b829165cb932e1f608dc41021bbfee864eff2eba81a3eb4a2290e111c2

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