Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9ad65ddab4ab3a…

MALICIOUS

PDF

86.1 KB Created: 2021-04-13 06:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ac047834737d0f3ba96d1dbaca1ea44 SHA-1: 1e595ff76455df61c9ca0281a477ead19bc09f6a SHA-256: 0f9ad65ddab4ab3a2a7091659fb38bc3d369bbd23d5f094c32593f4b6e1b0482
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF link farm" designed to generate SEO traffic. One prominent URL, 'https://mezovuduw.ru/strik?utm_term=how+to+make+a+triangle+in+photoshop', suggests a lure to a malicious site disguised as a search result. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+make+a+triangle+in+photoshop PDF link annotation
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/9173007.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/lagemud-zixizunugufuri-vebawuje-zorekufupe.pdfIn PDF document text
    • https://ruregogawumol.weebly.com/uploads/1/3/2/8/132815787/988644.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/donarepemi/what_does_garth_brooks_song_the_river_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9b7ec3-c30e-4e67-ab14-f254f77252b4/62934655376.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_3be1476075fd47c29639e148937e1b19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79fe894-9221-4944-903f-3c6827f9a74c/does_costco_sell_omron_blood_pressure_monitors.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_5ce1908664a24dfca5c4a08dab1c9005.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/lto_exam_tagalog_with_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06d80d8-91b1-42c0-acd1-e9335a2a1f2c/bufetewazap.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/rca_clock_radio_manual.pdfIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_263024bf8178469392789b4cd844a1bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/56653592939.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/msi_n1996_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e6dffb-448a-41f6-85bb-186a67a0ab50/cowon_plenue_d2_price_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/dodutepox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0dacb57-a5dd-4360-9108-2c21664700d6/how_to_make_a_toga_with_a_queen_size_sheet.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_8bae9ef7178f45f296e61ff4b799a16a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/candide_voltaire_nederlands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239c594a-43b1-4ffe-a303-d18991a55682/lavorara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ab4ad4-329b-470e-b866-794e9fc5e7d1/kisugujaworazimaluk.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/demon_hunter_transmog_guide_wow.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_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 5352 bytes
SHA-256: 3bfa52e6ec1cb7c7fc069889c1fec5a9afb590f4a19720bd0df41682cc44295e
font_01_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 10600 bytes
SHA-256: db09e7ac875e5eb6cd521d7015df561a0d7c9ef7a644641f512601c3558eccea

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