Malicious PDF — malware analysis report

Static analysis result for SHA-256 25375957e791eb27…

MALICIOUS

PDF

78.3 KB Created: 2021-03-22 14:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd741d901ab5cc3370e4e934fb09483f SHA-1: 5ecf6a5499bc7e1c96da985986bfccaea51aa50e SHA-256: 25375957e791eb279fb5c7eb176ab59bf8d0f59a7358e24b7173122fdcd51171
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and redirectors, suggests an attempt to lead users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns, likely using a spearphishing attachment as the initial access vector.

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/aws?utm_term=hibbeler+r.c.+2015+mechanics+of+materials+10th+edition+pearson PDF link annotation
    • http://reduslimitalia.website/spoofing_jurassic_world_aliveipx2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_6047c4e7eea2a.pdfIn PDF document text
    • https://cdn.sqhk.co/potonefamuve/0haEij1/financial_reporting_standards_uk_gaap.pdfIn PDF document text
    • http://docita.fun/nitakivuguigi97.pdfIn PDF document text
    • http://smartroom.pro/how_to_install_rear_brake_pad_clips3vzlp.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/5bzfDjb/rivika.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/eUphahe/does_free_tv_key_really_work.pdfIn PDF document text
    • http://1eyvgo.xyz/commission_payout_reporte58of.pdfIn PDF document text
    • http://wiregabjuk.fun/encyclopdie_philosophique_universelleo25y8.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/Hhb1khg/mirasukawejusamirujotiz.pdfIn PDF document text
    • http://cmbespaceclient.xyz/56499445251kjtbk.pdfIn PDF document text
    • https://cdn.sqhk.co/rotusorukazi/RjlidQm/nisenisakividuxexotete.pdfIn PDF document text
    • http://mon-cmbretagne.com/engineering_mechanics_moment_of_inertia6cy6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_602e75c4b3d06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dagasopones/current_acls_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/rupakige.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/blkmarket_free_reddit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 5768 bytes
SHA-256: 7612f444a46fc9834978815ff6d4775efe7f84b0c0455246b6de386f9de02e9b
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10652 bytes
SHA-256: 4a2fb6b4518d446981981b6800c03193bd4ff8b038e08575cbb6262694ed07b5
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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