Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb1777ccfbf8234…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 14:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 658788ceba26532a48336411b469d8b7 SHA-1: d8161dae58f57c2f5970699a2b9d1e71e1a515ac SHA-256: 5fb1777ccfbf82342d0b877343f43e6660e226e427f41e516842df3b710c39ca
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm hosted on disposable domains, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, flagging it as a phishing trojan.

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://druttle.ru/award?keyword=what+someone+is+in+love+with+you PDF link annotation
    • https://cdn.sqhk.co/batovafakupo/igfUigq/fresh_trim_hash.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/Aiitp86/jikeludegizusogoxenulewun.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/CKd1jct/tips_for_netflix_2020_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/eUjgx6d/slice_of_life.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/cijZ1d8/tuzulizidorisara.pdfIn PDF document text
    • https://cdn.sqhk.co/laxiroroweno/hdyggjd/51727915667.pdfIn PDF document text
    • https://cdn.sqhk.co/nexupumile/Jgj6uGA/love_ringtones_telugu_2020_telugu_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/jfhdDjd/freeway_rock_song.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/vusenarelafabe.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/jogogirizowusapoza.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/U0ve1gh/59381752980.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/kulixewuzozo.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/jlpouhf/zombie_strike_nerf_guns.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/bobumaradasa.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/zopajezibetufozej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xagadikexebixa.epizy.com/29216905723.pdfIn PDF document text
    • http://vofiwevo.epizy.com/mirutexamuloxux.pdfIn PDF document text
    • http://kewatolod.rf.gd/bzun_stock_earning_report_date.pdfIn PDF document text
    • http://bezekibep.epizy.com/22167821522.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_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 5096 bytes
SHA-256: 4faf50868069b6de708f19e6d8e469110c747731594441f216cebf16d372b569
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10592 bytes
SHA-256: 6bfb1cf7de3bce5f196b663678bec1311ba4ba324efb0a7ad4777e3e850b148b

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