Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3870aaf6a645fad…

MALICIOUS

PDF

80.0 KB Created: 2021-03-01 01:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 481a0da5aded8d274447aec821ba8ebc SHA-1: 0e4eda58648ba98cfc8a3360ac819555df253a9d SHA-256: f3870aaf6a645fad122cdb610064a6b0b495f2499d68576c975d02f8d5f4c478
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. While no scripts were extracted, the presence of numerous URLs, including suspicious ones like those on `golowaki.ru` and `iblogger.org`, indicates a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://golowaki.ru/award?keyword=who+is+gretel+in+the+boy+in+the+striped+pajamas PDF link annotation
    • http://bajexubazewa.iblogger.org/why_is_my_sony_tv_blinking_standby.pdfIn PDF document text
    • https://xivupofe.weebly.com/uploads/1/3/2/6/132681771/fosimodeb_riloneput.pdfIn PDF document text
    • https://robiduvasolowa.weebly.com/uploads/1/3/4/6/134657162/9304324.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/4167624.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/favozod.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/9138238.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/vixadif-lukutizamabuzu-nofipesagip.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/6285b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/fezuwelu.pdfIn PDF document text
    • http://piwuzodoxomox.epizy.com/zazubegupikokinufubego.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/gemusawidadujabob.pdfIn PDF document text
    • http://refuziw.epizy.com/takemazodomum.pdfIn PDF document text
    • http://bexituxupogetav.rf.gd/how_does_the_ability_to_interpret_the_constitution_limit_presidential.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/already_just_exercises.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 5704 bytes
SHA-256: dffc1c286afa974f5c622853f34bc37a18db1e1550b913943a1b14cfad57600b
font_01_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 10488 bytes
SHA-256: 98e2209689b93cbced2571078e08183135bee13900b7c1340b3b8d9229a668ac

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