Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e619796975ea51…

MALICIOUS

PDF

69.8 KB Created: 2020-11-14 22:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e7aeafcff510c5502c0a2b3402328676 SHA-1: fdb03d3f186c358aac1f1f4b96ab7e88ad7d02b8 SHA-256: b1e619796975ea51ca455a72a3cd113dcb3549d8bd50fb66281193f416f24b7d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains a large number of external links, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://trafffe.ru/123?utm_term=mice+in+walls+of+apartment PDF link annotation
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/gedonedekimuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5f9b9f4d0d9ee.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/sujezowerax-madomimu.pdfIn PDF document text
    • https://sabovewedasujak.weebly.com/uploads/1/3/4/4/134493104/sepogemined.pdfIn PDF document text
    • https://munevamowiwefan.weebly.com/uploads/1/3/4/4/134440094/aa31cc422f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5fa472af238d7.pdfIn PDF document text
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/250aae85307f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_5f9e24dcb2c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fa8204853d73.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://uploads.strikinglycdn.com/files/1e020cda-0682-48d7-8679-c9679cbeb90c/46700503617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eafe411-69ca-4689-830f-241b2a29562b/12926852367.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 5044 bytes
SHA-256: 4cd08fac0d4f92285d858238aabc2d8cea47c23b98627ed1f8a1d90b1ee3b24a
font_01_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 9876 bytes
SHA-256: 74ca75f725de56f816dd349abff3545b98ed9b8f8ce7b50a3382cfd897d53397
font_02_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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