Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5efb31d830fe94…

MALICIOUS

PDF

64.1 KB Created: 2020-12-11 01:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3f3d4a625e31fe0983776d338060d8c2 SHA-1: 1b5b69df00505d6a8ef7c855de03f8f3ca085dd9 SHA-256: 8e5efb31d830fe949618dde7ef3003b24fb889b957afbc1536b4b00f7492238d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'traffine.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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.
  • 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://traffine.ru/strik?utm_term=ozark+trail+6+person+dome+tent+12x8 In PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/muriwojogikuned_nuwemoxu.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/6715667.pdfIn PDF document text
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/dosolutuwubag-lajekunepajoteg-dapomubexelenop.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/b94e1a.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/jamokaroxoj/99031632087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8fa339-2963-48a3-a75d-0ce6e9d17cb1/numbers_in_word_form_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf0b964be903ae63f1c3d/1606217913777/lesson_6_activity_41.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/kyle_xy_temporada_3_castellano.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d8daa5bc066edfc77a21/t/5fcec33e55629615613e2cb0/1607385919941/wufusimozedowot.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/rejuxijenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45aafb1f-8554-4166-8b1d-ba5a53efe40a/kubatufew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0be4612facd59ceac2d5b/t/5fc4e9c69ee0f32b87edfadc/1606740424172/how_do_you_convert_172_cm_to_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d8616c-122f-4217-aba0-3daaa45a283a/ooma_login_page.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/australian_epilepsy_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1162b68612547ed5f39f0/t/5fd08090c0a29916a56d1803/1607499938046/supertuxkart_beta_download.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_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 5636 bytes
SHA-256: 5b5de3514a62db7eb19c4497e1f6b212fa456170187ab7d5eb515af3465c5620
font_01_sfnt_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 10624 bytes
SHA-256: fcda1a65be2d0d86a0e92d0a8734847cd7eccec1b88dc4905586fa3eeb27f6e1
font_02_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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