Malicious PDF — malware analysis report

Static analysis result for SHA-256 b345a9a8343eb24b…

MALICIOUS

PDF

75.2 KB Created: 2021-02-24 22:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1e44f8ccd17f78eac634db823defe8b5 SHA-1: b39355a689f43705a74da82aef1493a87b274e9f SHA-256: b345a9a8343eb24b99009684610f176dff67c20e18bfdd53ee96a0e16230a443
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and a large number of linked PDFs points towards an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/award?keyword=arduino+uno+ide+windows+10 PDF link annotation
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/tarevur_lajob_mupowezuz.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/18562933614.pdfIn PDF document text
    • http://devlp.club/karafojumojodabujkhek7.pdfIn PDF document text
    • http://tryadasert.online/public_speaking_skills_training_in_hyderabadkeb84.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/sobudozuwunu.pdfIn PDF document text
    • http://lnstagrambusiness.com/3._5_animal_companion_handbook0386c.pdfIn PDF document text
    • http://baltika-trans.com/bewitched_theme_song_freekrd2h.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/2535188.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/xekitulirejesimuve8klh5.pdfIn PDF document text
    • http://alcexpress1.xyz/jizunokupivjt9ew.pdfIn PDF document text
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/2742589.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/56a3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofexivagonipuz.rf.gd/cloud_atlas_book_avatar_movie_based_on.pdfIn PDF document text
    • http://migukim.rf.gd/85512734577.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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 4852 bytes
SHA-256: 9325a562fb6c7fd3637f4f2b81c2e0b8755c82090b8a849ba05e04c889ce52f0
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10196 bytes
SHA-256: dd265ca454e82fbd24067c242668761733d8e24cddd9b84c852b53de8d969af2

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