Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c4791b2482b530…

MALICIOUS

PDF

71.4 KB Created: 2021-02-23 13:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9aa1023e83fd73b2243044e7f367502 SHA-1: 17e79c27783e2859964dc9bf71e81538eab078b5 SHA-256: f1c4791b2482b5308ef14cf583fa0b98e71a62bc7b170833153d638a01115415
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=kenmore+70+pint+dehumidifier PDF link annotation
    • http://superheatbelt.xyz/88571546299m4rg5.pdfIn PDF document text
    • https://regapopuro.weebly.com/uploads/1/3/5/9/135964604/xozuketuvotow.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/682eddfe84b28.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/26a654f06c21ec8.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/3hghgFz/rifakukekevilisajomij.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/4233501.pdfIn PDF document text
    • https://womutiliwefol.weebly.com/uploads/1/3/5/9/135964171/3365856.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/2239003.pdfIn PDF document text
    • http://uorott.com/responsive_bootstrap_login_template_freen52rb.pdfIn PDF document text
    • http://glawerry.online/assassination_techniquesaucak.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/bapobepogumakiwakame.pdfIn PDF document text
    • http://akmurzina.com/timepukojovawubenomagupj7lul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitutudatiri.epizy.com/online_engineering_book_site.pdfIn PDF document text
    • http://zazadizowemizus.rf.gd/tilivigoj.pdfIn PDF document text
    • http://dumoripusino.epizy.com/how_to_make_a_refrigerant_recovery_unit.pdfIn PDF document text
    • http://girifej.epizy.com/filehippo_chrome_32_bit_free.pdfIn PDF document text
    • http://fajegexowesidet.rf.gd/wukalulap.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_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 5052 bytes
SHA-256: e47a5d31f53e419cf0e921532d90c9fda78bbf4224710b0dd5b507339412a4d9
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 10680 bytes
SHA-256: 389dc632f548b43538ccb7f58d5293478276f09cd4558a67842b4929ab94cd5e

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