Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45386746c52219f…

MALICIOUS

PDF

88.1 KB Created: 2021-03-21 12:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac7a306884c403b40f67a1eadd9842a1 SHA-1: bb6c2976fb9a875ae6a5fc4dbeb653b77900ecb9 SHA-256: d45386746c52219f7a9d8b77c24745e0f071eb4c26fee88ce7db317bcd8a2da7
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further support the malicious verdict, classifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and a 'download button' lure reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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.
  • 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://soxebez.ru/123?utm_term=android+studio+complete+tutorial PDF link annotation
    • http://strongcreditscore.info/how_do_i_apply_for_a_job_at_fedexpj66w.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/ChaB7HC/mimutatiwubo.pdfIn PDF document text
    • http://abistrans.ru/mogatoloxirzqgnv.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/avges0h/cheat_for_sims_4_money_mac.pdfIn PDF document text
    • http://profer-opt.ru/tahapan_sintesis_proteind986t.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/PmKCFhj/cerebriform_pattern_radiology.pdfIn PDF document text
    • http://itwow.info/divine_comedy_purgatoriot8n6r.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/EzNAieB/evil_lands_online_action_rpg_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/W1djgKy/koditanixulenemi.pdfIn PDF document text
    • https://rixesibajarij.weebly.com/uploads/1/3/4/7/134712387/7769896.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/33124f7e7.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/bamepaweme.pdfIn PDF document text
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/714837.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/fJ4dndX/munoxu.pdfIn PDF document text
    • http://help-business-media.com/how_to_develop_emotional_agilityqiv39.pdfIn PDF document text
    • https://cdn.sqhk.co/disanefamu/jcgeN6g/85634104842.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/53mhehe/fishing_clash_codes_may_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/i7Xo8t1/classic_slots_of_vegas_free_slot_games_apk.pdfIn PDF document text
    • http://agencymedia-ig.com/2003_cadillac_deville_service_manualvxz84.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/7411019.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/igcjeWX/hitman_games_ranked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_1efb4538d389485c842ed67c52dd5ae7.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_6cbf52e9a9574805aff138e275d6d94d.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_4f7b38e6320f4f12828e08c12ecc999f.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_dda70b8f76134c12a2cf383976f14843.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_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 5208 bytes
SHA-256: 7e7577e06f8d010eb298599cacf546e19f0b5e2160b950ace2d2fe781a3cccc3
font_01_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 11524 bytes
SHA-256: 164c9e002ba9252ce576c2331124c89c0c35b881fa909385c272be734ffd250f