Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fd77248dd80956…

MALICIOUS

PDF

71.1 KB Created: 2021-02-17 15:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e6b2ac7572bcc98461a21c6a179b953 SHA-1: 305f986b7ea1fc3bc781f36c57f466dcbd771399 SHA-256: 17fd77248dd80956d35f420645934fc96567be78abe427b443921c0a9f4ce2da
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=pathfinder+monster+generator PDF link annotation
    • https://cdn.sqhk.co/gimexigerub/mR6ERjc/elite_motors_inc._buy_sell_trade.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/hbijig1/photos_camera_hd_for_instagram.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/4107396.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hhf1r4f/45697643151.pdfIn PDF document text
    • https://xetupowo.weebly.com/uploads/1/3/1/3/131382232/noporejotuxiv-piwasavunesozo-vemazemimozeno.pdfIn PDF document text
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/7496770.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/hcsigjg/70186432936.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/etwNOhh/nurodifijiwiwotonupesupeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/xiewheI/new_horizon_mobile_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/cicuYij/abdominal_pain_and_bloating_irritable_bowel_syndrome.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/jhjbZie/homemade_lemonade_recipe_with_real_lemons_1_gallon.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/rutufokedizon/mixed_factoring_practice_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/ponurafino.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/breakage_cost_report.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/serugodadakazud.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/how_to_sync_soundpeats_headphones.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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 5292 bytes
SHA-256: d6229f6a6fb0f8c93aafb51a23ca1fef67570b7c0233717cbf797523922b2976
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10060 bytes
SHA-256: 43fbb22c8b76df3f9b2ee49d1c8a77ae8e747669e5f8b20055ce7b47eb2cdd59

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