Malicious PDF — malware analysis report

Static analysis result for SHA-256 4833cc7c54d4db81…

MALICIOUS

PDF

80.4 KB Created: 2021-04-15 01:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4a0d9e8457fc072de853815715db97d5 SHA-1: 2ec6c748b0c705a6c62b4bdb20dfc813fa99b717 SHA-256: 4833cc7c54d4db81c0e57f98ab8e0e6da9df51e5203e91402d7617d11c4820fc
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to search queries, suggesting a phishing or scam attempt. The presence of ClamAV detection and ML flagging further supports its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+long+does+taco+bell+serve+breakfast+till In PDF document text
    • https://cdn.sqhk.co/juvowisire/KUgiib3/24010297699.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/1239888.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/sherlock_holmes_series_download_1080p.pdfIn PDF document text
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/46860b739e33854.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/6100512.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/ThigTd5/21308501797.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwovado/djdwXmv/sound_dampening_sheets.pdfIn PDF document text
    • http://kabakotunaze.iblogger.org/baixar_weeny_free_extractor.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/cgfadgh/28739748819.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/cgdg2hg/kutodatebirofixolisos.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/roriwuletaneluxe.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/maytag_bravos_washer_not_spinning.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
    • http://jasigobup.epizy.com/trane_reviews_complaints.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_a98a488972014051a9faa1f4e4b4d1dd.pdf?index=trueIn PDF document text
    • http://rewosawobew.rf.gd/po_britannia_deck_plan.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_964a6fd79e504a20bc6829ab4a4dd5e8.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_c45505df07464296b698d7ae87402555.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_778300f3c9d34f238e3628d7ef8dca6e.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/arizona_learner_s_permit_manual.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5296 bytes
SHA-256: 66bced3beec760febbd9c92d62458dac8c937232a6de79195de51ec1d8093155
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 11160 bytes
SHA-256: 715da103c967e4d15745d414e108281ff1afbc988b703249fb46016cb227c7eb
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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