Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5985e480e47446…

MALICIOUS

PDF

71.8 KB Created: 2021-01-06 05:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 40b9fe235566a0e4509a732b68150751 SHA-1: 538714c32f0b2c31a81b9bc0b8400154eabc975a SHA-256: 2a5985e480e474468ecde765c96f7fc76062f4349586aa853640c364ebb55b2c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffine.ru', which is also listed as an embedded URL. The ML classifier and ClamAV also flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Autocad software free for windows', suggesting a lure to download software. The presence of embedded URLs and the malicious redirector strongly indicate an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/aws?utm_term=autocad+software+free++for+windows In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe55f6d9da05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f892ab62fd68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fde5f904d1e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c7dee4-f977-46d9-88bf-f23c12e04abd/argis_the_bulwark_where_to_find.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d63cf6-5caf-4229-8e7d-021a2d4da2d2/mix_app_for_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe670b93-a9d4-409e-befc-ce21ffbc28b0/energizer_energi_to_go.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/kalnirnay_dec_2018_marathi_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d49ac5-903d-4002-aeaf-f11f3627ba28/5368157889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b105b5b-e19b-4d56-bcf2-a2e05c371e84/30676837902.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/temiwagubarusanis.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/mcgraw_hill_ap_us_history_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e83365-460f-4f64-a23e-8672c535c9ac/fasexobidu.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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 5064 bytes
SHA-256: 0867b97f51385f578b9398db2b0bf447e7ef940246eeb714f9f5c163224b87f0
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10336 bytes
SHA-256: 7354badeaf941939100a607dd55f1ed3c9f59cd9dc79848be8aeaf5f17dede04

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