Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9b38bbde308446…

MALICIOUS

PDF

71.0 KB Created: 2021-05-28 10:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 39d42cb2bb0c807c51e2b057f503e1bd SHA-1: 674cf9f7ac5319c6c93e90d3d2d0910c5cf7ad01 SHA-256: 3a9b38bbde308446bff38c82f63ed70635b55ed187bd502a2a8d00abeae87e4f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 scam attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded document body, though partially corrupted, contains text related to online exercises, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://pelibifir.ru/strik?utm_term=accord+participe+pass%25C3%25A9+exercices+en+ligne PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5ff7944ef2501.pdfIn PDF document text
    • https://gapulujazupimes.weebly.com/uploads/1/3/4/7/134775062/sedome-zopefigerim-rototagi-vufujepidawog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489404/normal_6008879c8d13e.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/kigemajatiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fd17a899d84e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5ffe482bc392d.pdfIn PDF document text
    • https://saxijafuduzota.weebly.com/uploads/1/3/4/6/134692269/xepizaj_xudejikizufa_dobegonumenit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_606085e310f37.pdfIn PDF document text
    • https://kivopovolufom.weebly.com/uploads/1/3/3/9/133997215/5015507.pdfIn PDF document text
    • https://puvudidaf.weebly.com/uploads/1/3/4/2/134266954/wesogonileda_pumominam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_6025ed95200fd.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/84a7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6015993548618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_602a8a9a6dcff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_6046c84ed45d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fca89adacd19.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476275/normal_60aff199bcf0c.pdfIn PDF document text
    • https://pudewufaziv.weebly.com/uploads/1/3/0/7/130739775/pafugo.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/2700494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fd79b3abb594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 5440 bytes
SHA-256: 4289e5d599f95aaa36e2a9b225199a42713dd20b0e07787bdbb3f7c3b63e0805
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 12788 bytes
SHA-256: bf068ae609f3ca4f8efa61f93c23ddef52dc1c531823953ed9565ec16321228b

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