Malicious PDF — malware analysis report

Static analysis result for SHA-256 67decde3a3139ee5…

MALICIOUS

PDF

75.0 KB Created: 2020-12-19 12:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3628f04bac9bd30314f2a7ca2d770222 SHA-1: 79ffc0e027811679bbdf60d6da2a2ecf0f794a95 SHA-256: 67decde3a3139ee54d954cfc65c7cd0e31d3277bb2685e29f64f6c40ef81d9a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/strik?utm_term=school+supplies+list+for+5th+grade+2019
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/6554348.pdf
    • https://cdn-cms.f-static.net/uploads/4495694/normal_5fabc91c710ad.pdf
    • https://cdn-cms.f-static.net/uploads/4470222/normal_5fb8481aebd74.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/vusaxi-wesaguxiniwira-sidexotagutexen.pdf
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/7010252.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fa0ed556e14f.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fbf33ef2a514.pdf
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/bomubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0a0068c-1675-4510-9ea0-42a1edc37f72/jennair_gas_range_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/6e2c8772-c78c-48ca-8b35-097fa61580d1/.pdf
    • https://uploads.strikinglycdn.com/files/ee61c70f-1671-40e8-9703-8f7f2fa03c77/jifirelarakugolikosubon.pdf
    • https://uploads.strikinglycdn.com/files/cdd9e176-e8ed-4aec-ac45-76dcb2af59ac/how_to_change_ship_color_no_man_s_sky.pdf
    • https://uploads.strikinglycdn.com/files/308f76df-f613-48f0-a076-cb4888a0d259/fogeburididedodalugepe.pdf
    • https://static1.squarespace.com/static/5fcde8b6c1e311104da4cca1/t/5fcf228505f6f2780753872c/1607410312343/photo_editor_software_offline.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001027c.bin
a45c7482f8c5142b402c67a8d300ea517d0e825d27ecf46ef20a8a286bc554bb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1027C 18180 bytes
font_00_sfnt_off0000cab7.bin
3a23e056d5c50340e20737954f7198486bce213a8232c9a3eb3994f4d1243f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 6124 bytes
font_01_sfnt_off0000df8f.bin
7a139a1cab4b606accdb7339a4a8c66086d00ad4d4a58c2dc2dab916dc4db875		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10196 bytes

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