Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4cb3664a21f997…

MALICIOUS

PDF

85.8 KB Created: 2021-01-21 00:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b2fe8b0daf73ac7ecdbca807b71d8bdf SHA-1: 8318a2acda9385c41496b5c4a75ed50f551cb313 SHA-256: 9a4cb3664a21f997a872d70bf4d07b350d9cf6d0c82d05bec42f937a341088c0
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, strongly suggesting a link farm or phishing lure. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafftec.ru/123?utm_term=itil+benchmark+metrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456398/normal_5fad613823ed0.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/android_10_support_samsung_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/jhfbghx/pojav_launcher_minecraft_java_edition.pdfIn PDF document text
    • https://site-1187516.mozfiles.com/files/1187516/75478239186.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/50TUGhj/ceo_simulator_steam.pdfIn PDF document text
    • https://site-1189425.mozfiles.com/files/1189425/7_day_smoothie_weight_loss_diet_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/woledowo/9ijhecd/dirt_bike_hill_climbing_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5faf0de16fd36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_5fa76e6896f2c.pdfIn PDF document text
    • http://lanufutado.22web.org/adobe_acrobat_scanned_to_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fc6f11895668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502698/normal_5ff21d72390ba.pdfIn PDF document text
    • https://site-1212500.mozfiles.com/files/1212500/43270218247.pdfIn PDF document text
    • https://site-1178426.mozfiles.com/files/1178426/nepatepel.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/ahhviiY/45096758472.pdfIn PDF document text
    • https://site-1177842.mozfiles.com/files/1177842/3209518248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://porumujowupof.epizy.com/88490198081.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 4860 bytes
SHA-256: 3618a3d4e1535ebaeb3d7d6428197e0652b152fdcdaee3113d79a860ac4647f1
font_01_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 11368 bytes
SHA-256: e5f317e8b7ae90aaadce8de86466c6d5487a18bf40acade919388cf8f4469cac
font_02_sfnt_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.