Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1e2b451f1d5180…

MALICIOUS

PDF

79.2 KB Created: 2021-02-22 03:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5635c3330b8953b337947701feb8c61d SHA-1: 685806bb166e7b0ddc471e7088d282ab3f3fe4d3 SHA-256: 1d1e2b451f1d5180a12fa9b7a493f929c5197518241c3771d8ca71864558d6e7
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external PDF links, many hosted on disposable domains, suggesting an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes. The presence of a callback lure heuristic indicates the document is designed to trick users into calling a fraudulent phone number.

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) or Microsoft license-boilerplate 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://maypoin.ru/wix?keyword=manual+traction+cpt+code PDF link annotation
    • http://expressday.online/walutunegepobibuxwmap.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/haigHgj/fidutedesabagelo.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/jjbhfje/hot_wheels_ultimate_garage_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jjfgejb/23886224944.pdfIn PDF document text
    • http://forexgeeks.net/pharmacoepidemiology_and_pharmacoeconomics_textbookhuvcp.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/zedufinopobipekepuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/dq6rm1E/slendrina_the_cellar_2_mod_menu_apk_download.pdfIn PDF document text
    • https://vaxurubezinijor.weebly.com/uploads/1/3/4/6/134690270/a707163482d8efe.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/2012477.pdfIn PDF document text
    • http://good-production11.site/wezebopizenexuvexojisagobd21r.pdfIn PDF document text
    • http://piredvizhnik.com/fizijebiguweimtpe.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/dusenelirepa.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/VThezVh/kerapusesonitud.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/e80ed5e.pdfIn PDF document text
    • http://trackcreditscore.info/a_visit_from_the_goon_squad_charactersoago5.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/nagudo/31486948397.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/vidmate_apkpure_for_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/1953519155.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_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 4896 bytes
SHA-256: cdcd5baae8a5ac55473e1c61955471c4d34fff1f6e9e15d809e6cf4aac24c3d7
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 11084 bytes
SHA-256: 59806ef4e6f0ff4c1898de9470e5c0176762ce6385bcd2d3e9b98e1066755404