Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35d0371cc59cf41…

MALICIOUS

PDF

84.2 KB Created: 2021-03-10 00:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77d56e768025c089a032fbb94b8cdc6a SHA-1: 667920e0a2a5d23c8c53f5cf8a38b638b2a976da SHA-256: c35d0371cc59cf41714d8c10dad1901d579a51675cdb67c7313a3dff0493cf2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL leading to a suspicious domain. ClamAV and ML classifiers strongly indicate malicious content, specifically phishing and trojan activity. The document's structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/123?utm_term=lawyer+complaint+letter+template
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/pakuberutasi.pdf
    • https://sefagovat.weebly.com/uploads/1/3/4/4/134402874/eb80f052172a.pdf
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/fifokifa.pdf
    • http://sukalobuvigaz.22web.org/edible_plants_in_texas.pdf
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fcf2e1f08dec.pdf
    • https://cdn-cms.f-static.net/uploads/4465704/normal_601e8fa78b6fd.pdf
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/kowefi.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_601fff36dfda0.pdf
    • https://cdn-cms.f-static.net/uploads/4462066/normal_600faf839daee.pdf
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6023fe723f6b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_8b4f7b9d0b8f400ca091c32412782bae.pdf?index=true
    • https://s3.amazonaws.com/forupokisip/watom.pdf
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_ff1315d3ffc44c669c797fab6b4ebb0b.pdf?index=true
    • https://s3.amazonaws.com/pizexopenaxu/vimuguzilekelanu.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_3811bb413a964ea09418d4b8a7a04aea.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_f12d4ee27d7b4b92ba00b4da83857d3c.pdf?index=true
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_0005706b16c14e61bdd8cd094af5ed2b.pdf?index=true
    • https://s3.amazonaws.com/kalanejaxutilif/69098138762.pdf
    • http://welemup.rf.gd/47883561247.pdf
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_d51172de4b3540fe85ace45f39e70ed1.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_d330ef7dd8c64c4399b8e96cb9013e64.pdf?index=true
    • https://s3.amazonaws.com/rivazixexuguri/naveminif.pdf
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_df7e1cf27db545aabc21d3222f38cf66.pdf?index=true
    • https://s3.amazonaws.com/bubodeliza/81663572914.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010008.bin
cfc7ac54f32de5047fbc77cec3654ceede7bcb4495c37da3d387263d2d961964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 4824 bytes
font_01_sfnt_off00011064.bin
bc9f051d90028bf04c1f6082b21cfcae1232cbc38aac5d0fa64dfc10f715ea6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10804 bytes
font_02_sfnt_off0001355d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 4324 bytes

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