Malicious PDF — malware analysis report

Static analysis result for SHA-256 0785c8600bd313ea…

MALICIOUS

PDF

64.9 KB Created: 2021-02-11 14:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0763c94c417716e07ffdcdb5d6e036c2 SHA-1: 3b8390bcde79726b496e07f33e99ab765dd441d5 SHA-256: 0785c8600bd313eaf551397570cbf58eb96003054cdd7b910c00f00d77ad786c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or SEO abuse tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

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 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.
  • 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/aws?utm_term=faustformel+anhalteweg+auto PDF link annotation
    • https://cdn.sqhk.co/sututidogo/hfgffig/mountain_climb_stunt_off_road_mod_apk.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/vokaboki.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/cjb6ij3/ar_sandbox_projector.pdfIn PDF document text
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/4369178.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/4je2Ijf/ejen_ali_emergency_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/dBzbiqh/82884163407.pdfIn PDF document text
    • http://fomaxos.22web.org/punjab_textbook_english_9th_class.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/P8hgjhf/transmission_fluid_flush_cost_canadian_tire.pdfIn PDF document text
    • https://cdn.sqhk.co/rebawigabog/idPjjhz/wenolitetu.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/fyibii8/14628868238.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/ehg0bif/ruxexatofepajepurenidib.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/tomamujuf/nombres_de_formas_gramaticales.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bokken_kata.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/information_technology_skills_resume_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/gogadogajujad.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/bipazuruxafiwajugeru.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_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 5228 bytes
SHA-256: 64537969867e030c990187ffde92186b091f3c4cb531ba0b1b0cd6c3da8daaac
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10144 bytes
SHA-256: 41243e95afdece0aaf4247edcb34eb8d45d274569d9061b142c32d54fcb8150a

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