Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af4fe505db3e188…

MALICIOUS

PDF

65.0 KB Created: 2020-11-10 02:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 262374e02d012f1d707ed7aa15227f8f SHA-1: bbe906cb025d4146242ebab7ab234b33fcb6e6f8 SHA-256: 2af4fe505db3e188363403a5fd99c9b08b1ae87c90456cfdb0870df9c45d45e3
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?keyword=gta+5+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fa712f88634b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5f98c4453bf53.pdfIn PDF document text
    • https://fuloremazugad.weebly.com/uploads/1/3/4/3/134356453/0e8fa0eb4b7243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5f97016f6a556.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/b09672c904e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f8d68fecdfe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f8f599b292fe.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/d9432a51c7311a1.pdfIn PDF document text
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/gegorag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fa521201a388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bepukuba/boduz.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/95218746922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207d7275-c7d7-4cdb-bf60-c1aef30a24de/klein_isd_board.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_off0000c287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 4964 bytes
SHA-256: 6d2c14a03c819f6b85a7e0fe33aabb8a72f5c07363bb4b2a34f5b6b85bc35e9b
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10632 bytes
SHA-256: 36bbfb08a880a0aaf3f4f1bc103f2221aa624a00db4dd78a42c07455169b537a

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