Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27df43c40aaab95…

MALICIOUS

PDF

74.0 KB Created: 2020-11-14 08:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f3831cfaad7ca6ce42a480f6fd483ca5 SHA-1: dd45f14936f68201a8cacf7eda42ee8c51a6ef13 SHA-256: b27df43c40aaab95f46f7d43b30dd748fb3ea50739120204f287b7f5c15f126f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The presence of a known malicious redirector URL further supports this. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=suites+terminale+s+exercices+corrig%25C3%25A9s In PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/c048541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_5fa913d7d8955.pdfIn PDF document text
    • https://fakanodadix.weebly.com/uploads/1/3/4/3/134371587/3596035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5f9c9ae589883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f87873e512bb.pdfIn PDF document text
    • https://dubutabinagi.weebly.com/uploads/1/3/4/4/134441981/7212492.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/6241819.pdfIn PDF document text
    • https://kugugurufive.weebly.com/uploads/1/3/4/1/134108893/ad5db28fb76451.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/8652910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f88f6930e68e.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/a308adca0d.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/rowegabosimav.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/30925ec2-b2d3-406f-bc03-24835df178e5/livros_sobre_pnl_em.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/lowrance_hds_9_gen2_touch_manual.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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 5432 bytes
SHA-256: 845dfc5b2a5374ab623c190e581cf9a5de14a1f7c4b148afd5e6a356dbe0f796
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 11788 bytes
SHA-256: cd28e2cfe01321b9f99547921a2d01aa7454cfa7ed9d58b69dffbe6c74ec177d
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16100 bytes
SHA-256: b4d7b5f87a8978f1277a285276ee3d2548d8364787386596eceaf3166abf6284

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