Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd98697c78d8d70e…

MALICIOUS

PDF

108.8 KB Created: 2021-05-14 14:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e491a1049d259ed4a8eabc4c0a1a22a SHA-1: dd87a724f090cfb2fd6ffa1b9ba184e77d3e6b49 SHA-256: cd98697c78d8d70eaa8fd9e3f9d846a41798e7adfe3e7f8f575ddf4153cb2c06
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded links likely serve to redirect users to malicious sites for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=famous+american+novelists+21st+century
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/d2758c67b.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6024b7474ee54.pdf
    • https://cdn-cms.f-static.net/uploads/4404976/normal_60304de821e1c.pdf
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/vilosewevesupa.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_601d04ff124c4.pdf
    • https://cdn-cms.f-static.net/uploads/4490141/normal_604de4976a1cc.pdf
    • https://cdn-cms.f-static.net/uploads/4389601/normal_6060e4bc03669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vuxalirudidel/bluetooth_wireless_earbuds_for_android.pdf
    • https://s3.amazonaws.com/davubewu/menuxaxutebetikepegapopuv.pdf
    • https://uploads.strikinglycdn.com/files/e7ddbd89-253d-4744-ad43-f65ae87a3b37/30402808894.pdf
    • https://uploads.strikinglycdn.com/files/276db914-09c3-4173-81fc-f56cd31c3dbe/direrutorax.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_f35cdb15e53343a4b65a39624885baa5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ca7ea0a-68f8-48bd-a497-ce9b761b5c5b/guferar.pdf
    • https://uploads.strikinglycdn.com/files/db0f1143-77ea-49eb-9d2e-3ce152a423a1/why_was_americas_next_top_model_cancelled.pdf
    • https://s3.amazonaws.com/wefadep/70136137986.pdf
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_7318b925607347149a1c17bc3569b390.pdf?index=true
    • https://s3.amazonaws.com/setigafat/skyrim_guide_book_gamestop.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_off00015faa.bin
e6073e435b2cb62f3abe890e848057b63d23059a8ff4aaaab9cf67012066291d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAA 5128 bytes
font_01_sfnt_off00017114.bin
61d8c034dd9a9b0ac88951c1f349ca9e19972d1d9dea8c64356be3d52af4d804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17114 11816 bytes
font_02_sfnt_off000197db.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197DB 4324 bytes

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