Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03734393767300c…

MALICIOUS

PDF

77.2 KB Created: 2020-11-28 18:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e63f99a1f941c4f68e381c7944499572 SHA-1: cb9de555313fa18c83aa6518dfaea866c6b7cdc5 SHA-256: f03734393767300cb775bd13f6bce444eb8c07d577d4d7c1836525f8f4a99dbc
242 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7721

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?utm_term=kenneth+frampton+modern+architecture In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_5fa9db6e2e48b.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/kobaworer_guputu_ginekudogujekob_borakowupojexoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fc11f6db9341.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/9870613.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/lolas_daxewurufavi_xerolel_kirubitufebixew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fa68fa7a37c1.pdfIn PDF document text
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/4e0266d2.pdfIn PDF document text
    • https://bowulotufevep.weebly.com/uploads/1/3/4/5/134595608/lewebawot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5fa8753d2e6ba.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/mesotodimus/45902872022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e09d7b4-baf6-4eca-95a9-96e48cc07836/89011179372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b273fc-954e-4b92-a9c0-612ba96bc4a6/10610145784.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxibipan/download_avengers_endgame_4k.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001190e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1190E 13144 bytes
SHA-256: 53294ae45ae35838b4e151b11e9cccf07f48640940f15165f289d9abb292baf8
font_00_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 5156 bytes
SHA-256: 572f2f8946d627ed95f19a1ef00764f1db20e527bb5bcdd066ffa1d8a90e69d7
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 11844 bytes
SHA-256: 411b80b1406ddac3ace614aa983b7a664920ed6274d1f783585a6aa14dc2f925

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