Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4db2bd0eb35c1d…

MALICIOUS

PDF

81.6 KB Created: 2021-02-02 05:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 531456f32b425a5b1df31cdbec020379 SHA-1: aab3b8116de920566d5fb94e3fde09de3a28d56a SHA-256: 6a4db2bd0eb35c1dba75f89ac660affd5e66a2cb86533d7e53212984fecd7459
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document also contains an instruction to disable security software, a common tactic in phishing and malware delivery to bypass defenses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://bologen.ru/123?utm_term=advanced+systemcare+12+key PDF link annotation
    • https://cdn.sqhk.co/duvapegoleva/5aheOGs/61506429770.pdfIn PDF document text
    • http://upgrade4me.com/subopadavenarajatalavitu5orli.pdfIn PDF document text
    • https://tivavazo.weebly.com/uploads/1/3/5/3/135337759/c00ec958b2f.pdfIn PDF document text
    • https://cdn.sqhk.co/nagigureti/iaibjfo/38706591429.pdfIn PDF document text
    • http://sewamagiz.66ghz.com/arcore_android_sample.pdfIn PDF document text
    • http://ideal-it.fun/dragon_city_element_battle_guideoq9oy.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/ihWgfge/wasuwujuzumijadaresoxawax.pdfIn PDF document text
    • http://praktika-ingenieur.com/download_kissanime_videoszef73.pdfIn PDF document text
    • http://slampochka.ru/7._1_our_planet_of_lifecyy3l.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/eCjfibQ/beautiful_wallpapers_for_mobile_hd.pdfIn PDF document text
    • https://pitinolulisam.weebly.com/uploads/1/3/1/3/131381612/2210497.pdfIn PDF document text
    • http://doctora.club/tusafurewr86u.pdfIn PDF document text
    • http://interplast.ru/dwop_notice_to_quitzbgzr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxumejaxumem.epizy.com/kaala_patthar_film_song.pdfIn PDF document text
    • http://tugupora.epizy.com/pozemezivuxib.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/bein_sports_connect_android_tv_apk.pdfIn PDF document text
    • http://rajafidaforuzav.epizy.com/gufete.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_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 5452 bytes
SHA-256: f511e3532c6b407909b878ae9b9f2d4d81e5548de225997205d9cdeec786371a
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 11400 bytes
SHA-256: 64b56469b8a9d9b9ce361340e234d4a64223014a81b0766b0e14544b0ced59a6

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