Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c7d7718039c185…

MALICIOUS

PDF

70.0 KB Created: 2021-04-01 23:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14c61cc1f664827dbdec33d9ba921b0a SHA-1: 9acc5dce5bf4eb0d9281500422ed8e1d2cfb1f5d SHA-256: b7c7d7718039c18508689660ab85b447db3594bdfc6182e61548edebf9a7a46d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a link farm designed to manipulate search engine results or host malicious content. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or trojan 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://pelibifir.ru/aws?utm_term=thea+stilton+special+edition+books+list
    • https://bisadujepuza.weebly.com/uploads/1/3/4/4/134444209/wunela-wikakasito-gefiwodagilizu-mipaf.pdf
    • https://cdn.sqhk.co/bugolajoxodu/txthhaL/futuwe.pdf
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/4036916.pdf
    • https://cdn.sqhk.co/tebefaravuz/frlalha/music_ideas_for_alexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gogonof/succession_planning_ppt_free.pdf
    • https://uploads.strikinglycdn.com/files/57b1a98c-ff71-4c52-a6cc-7f520173dde8/86599328073.pdf
    • https://uploads.strikinglycdn.com/files/5e866eb3-e319-42df-923b-43edf5ee96ea/corsair_k95_rgb_18_macro.pdf
    • https://s3.amazonaws.com/petubapizo/wipumu.pdf
    • https://s3.amazonaws.com/veraxawewib/dell_latitude_e6430_battery_light_flashing_orange.pdf
    • https://s3.amazonaws.com/muvarelo/42079723895.pdf
    • https://s3.amazonaws.com/betefowubevat/16487712657.pdf
    • https://s3.amazonaws.com/nitizobuv/vokidesifim.pdf
    • https://s3.amazonaws.com/sefipa/reacciones_de_combustion_ejemplos_de_la_vida_cotidiana.pdf
    • https://s3.amazonaws.com/muxegeza/41905095794.pdf
    • https://s3.amazonaws.com/remeranexe/2660700602.pdf
    • https://s3.amazonaws.com/sitok/56755586995.pdf
    • https://uploads.strikinglycdn.com/files/35231b6e-bd68-4fde-92e7-da1c6d7221d6/temple_of_seti_titan_quest.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f0.bin
2e6b7f935708f1c29e80948aa66d632569d3db9328614d3f40489e9072028fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5216 bytes
font_01_sfnt_off0000e8a0.bin
c1b8d6e2700485ad00e69e10637359fc1406a01fe5bc4e6d5d5986f1cf0ebf10
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 10088 bytes