Malicious PDF — malware analysis report

Static analysis result for SHA-256 04529b5eb26a67aa…

MALICIOUS

PDF

85.0 KB Created: 2021-04-23 04:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25c2e6b1fe891c870cf5d5772ed45f4e SHA-1: 98c77e51226b827ab9c30f91651f364419f25ac6 SHA-256: 04529b5eb26a67aae23df60975a9447db91b82b8fa2b6d659c7f235d2682fa69
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary focus on 'https://jacksth.ru/strik?utm_term=which+dish+receiver+is+best', suggesting a phishing or malware distribution lure. The document body, though heavily corrupted, contains fragments related to 'dish receiver' and authoring information, reinforcing the lure. The presence of multiple links on disposable hosting further supports a malicious classification.

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://jacksth.ru/strik?utm_term=which+dish+receiver+is+best PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455183/normal_6052563cc3657.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/wagise.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/nimh_bipolar_disorder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fd77d78a4559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_601924cec387e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fcbae6aa46be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_600f7107ce683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudaxaj.rf.gd/suzikunani.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_784eb413217e46a7865c2a957ac92599.pdf?index=trueIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/coerver_soccer_training.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_04b5538b7d8e406caa85b507f0b093ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/constrained_weighted_factor_scoring_model.pdfIn PDF document text
    • http://kosirokuki.epizy.com/finding_the_perimeter_of_a_semicircle_worksheet.pdfIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_db4f79f1a0b741f78c14b57586a01cb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pezofut/the_cask_of_amontillado_character_analysis_fortunato.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_051b1494d131428d81a57940552f77e9.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_8d6b6b84a012491680276d4f8b712532.pdf?index=trueIn 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_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 4996 bytes
SHA-256: 712db8b741805c62fb513d2348fd62265b0c587d0e9d71b0946d16169bd567b8
font_01_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 13372 bytes
SHA-256: ef3222bae6854ed80ba7ae0c2e06ab8ed77725c6bfb1a33f87e40d96b2405ab6

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