Malicious PDF — malware analysis report

Static analysis result for SHA-256 923fd22f42ac7f37…

MALICIOUS

PDF

75.6 KB Created: 2021-02-26 12:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 009a57374583ae8af44b0c5ac4c5bc5d SHA-1: 33358712e4450b909617e031db565148066a206c SHA-256: 923fd22f42ac7f37092aeda9cdd6ed7a59b4fe5228e49d8dadd4e43a7bdb6602
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to job searching, which is then linked to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+to+get+a+software+job+with+no+experience PDF link annotation
    • http://re-capital.ru/production_and_operations_analysis_7th_edition_downloaducxri.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/2hchbPQ/sixukepoke.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/554710.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/V4Ljbif/world_cup_2020_date_fortnite.pdfIn PDF document text
    • http://runivofo.iblogger.org/math_worksheets_grade_3_multiplication.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/fd295.pdfIn PDF document text
    • http://varistop.site/tammy_hembrow_booty_guides2v1k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekiputozuda.epizy.com/lasko_fan_remote_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/xosapozamud.pdfIn PDF document text
    • http://lofadezowudekeg.epizy.com/87390439257.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/angular_disable_form_group.pdfIn PDF document text
    • http://jopasimu.rf.gd/boxuxug.pdfIn PDF document text
    • http://xifabopopotesa.epizy.com/best_background_wallpaper_hd.pdfIn PDF document text
    • http://lidikulogape.rf.gd/free_5x7_collage_template_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/94698706599.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/7560635916.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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5584 bytes
SHA-256: ad711f6007bc8dda81b95dc8d30c914b6d726519fab09c3553e2800989fcc597
font_01_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 10820 bytes
SHA-256: 843104a7423e809b120f3c18de7419b77a3b7509fea033502fbf51aed807655b

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