Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93836c1257cc112…

MALICIOUS

PDF

81.5 KB Created: 2020-11-25 01:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b41bede3ef17ad12a6bf029a115d59ab SHA-1: 007c56d09005310ecd13c1ebd1d589c5683b3ceb SHA-256: f93836c1257cc112f34717fb7a6b2e4f337bf1a1b7c292c183e3600b8ef962ea
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL, directing to 'traffnew.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=percent+composition+calculation PDF link annotation
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/16ebc5f9bcf.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/ca209731-3827-4df1-8c39-0e164a7e4cd6/grande_marinade_de_poitrine_de_poule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15420c93-c6e3-4328-9b6f-be4972cc3e0c/dedukimag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4f2d31-a777-4a19-b275-875662bdc487/earthbound_manual_snes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a78a7eb-4e5b-4fb8-b5bc-7a024aa54146/21988679550.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/affidavit_of_support_form_for_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/state_election_commission_maharashtra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a625c5-0cf8-4b56-8758-58fbb2584349/8420405769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0962f000-db8d-4576-88fc-53de4033dee7/6534998633.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/attendance_sheet_google_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fc3412-f40c-446a-a506-773e5fb4a5e0/rutukotinejiwuvanujo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 5080 bytes
SHA-256: 79e717b6aa84cb68c27386af8bd88ef05c82be4d14c01eb8191c825ccdcf7bea
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 11128 bytes
SHA-256: 6be9b75ae47875fa17a77765d9fe9ee6b4bd9e34258d49776819220231af41f7
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 16832 bytes
SHA-256: 0221fff2d8d130917e5f4dd811b84cc5d18f77fd71dac5a6ad999cb45c400810

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