Malicious PDF — malware analysis report

Static analysis result for SHA-256 424b79e0da7550cb…

MALICIOUS

PDF

127.1 KB Created: 2020-11-18 11:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbb12a13edcf692a5c7b4c59b21e17f4 SHA-1: 164ee8a21428109a2b9fa86b2e621887a2d7ade7 SHA-256: 424b79e0da7550cb6464f115f20972956ab176a3062f313f591a5d85984b4f36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'traffking.ru', suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=diccionario+de+competencias+chiavenato
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/xexibegiduta.pdf
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/4541484.pdf
    • https://sazinuje.weebly.com/uploads/1/3/4/5/134588850/0cbcca791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3568c7cc-1f39-4831-852e-a95502f4d613/insect_study_merit_badge_worksheet_answers.pdf
    • https://s3.amazonaws.com/lixasifasi/27507945008.pdf
    • https://s3.amazonaws.com/texifaxepag/delonghi_oil_heater_manual_dl2401tf.pdf
    • https://uploads.strikinglycdn.com/files/1b9da642-c6c0-400f-84b1-0a4c49b740dc/57610799260.pdf
    • https://uploads.strikinglycdn.com/files/e3625b27-ac67-4aab-aae0-974fc6572023/dovuxegopovovibavetivim.pdf
    • https://uploads.strikinglycdn.com/files/ad24eb2d-6f22-44ef-a180-4faf18a19cb7/lori_loughlin_court_time.pdf
    • https://s3.amazonaws.com/mamibis/2013_ford_focus_repair_manual.pdf
    • https://s3.amazonaws.com/dazutun/85709427082.pdf
    • https://uploads.strikinglycdn.com/files/3b82d862-45a5-4443-a7cc-58a811441d13/61249489279.pdf
    • https://uploads.strikinglycdn.com/files/bea0647a-3d94-4332-a4ed-eccced38e3d4/47762869909.pdf
    • https://uploads.strikinglycdn.com/files/506dbc1c-963e-44d3-bea6-7b01f6ff8ddb/89624922039.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/aurobindo_ghosh_books_in_hindi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b4e4.bin
a61c5dea87d4ed1b961ad91584b4a7a3461a41241af2c6ea90a30d5a5a753df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4E4 5340 bytes
font_01_sfnt_off0001c6ee.bin
9fd96a87c0e73e72dc0d7ba76107f4d11a0e9e0716fe69186590239b7f15b7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6EE 11784 bytes