Malicious PDF — malware analysis report

Static analysis result for SHA-256 833217169416854a…

MALICIOUS

PDF

74.1 KB Created: 2021-01-21 02:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0981e3f111e0ac03906d7e189de48417 SHA-1: 384de2acf698e0c26017b5e77f7142a3fa71c922 SHA-256: 833217169416854a0832fb1e953e5e82551863081d86742a7002e2c83ef14dcc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. 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. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate an attempt to exploit users through redirection, aligning with common phishing and malware distribution tactics.

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/123?utm_term=first+hebrew+letter PDF link annotation
    • https://cdn.sqhk.co/xeliwiwogivo/XUaigMP/best_shooting_guard_2k20_build.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/W3z49nS/voribas.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/radowilumijazoriw.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/CgjTdie/infection_preventionist_jobs_in_phoenix_area.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/iifjdhb/dajameludorigopememuj.pdfIn PDF document text
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/77f702223.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/eqegjDV/tagumigegines.pdfIn PDF document text
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/gokovuvimapesewitamo.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/ifhdWic/zufexowalexulabaxozovup.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/winubizisure-rodumosedasebix-mewaledidave-latati.pdfIn PDF document text
    • http://rosovutuwonemis.iblogger.org/plague_inc_mega_brutal_guide_fungus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosener.epizy.com/we_are_electric_flying_steps.pdfIn PDF document text
    • http://lewimidofi.epizy.com/duzuwunomutubemevalitajeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/fusionner_des_mac.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_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 4752 bytes
SHA-256: 46ae7e01621cc28e3b9579b0c2b125cb8497e8db87c1ca0b3f9ef1a0e5c2667e
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10524 bytes
SHA-256: 32b726a4a6c6957caf25d1e974fdf273e73e73203937b4cc141e3e16215abe0b

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