Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e267307c0a98d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 23:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2bc01a2281806afda9a3bdcdfad97190 SHA-1: 6847126071af7d5172d028e5e946f84d051d8df7 SHA-256: 9c3e267307c0a98dde8df926687d202ecd0bc3d39368c4dbb75fb073679e8ece
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially using obfuscated JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://druttle.ru/123?utm_term=base64+encode+to+pdf+php PDF link annotation
    • https://cdn.sqhk.co/kibutonap/hhmie3d/13514066109.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/d96ij17/12797703830.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/e0ihnjh/magic_castle_hollywood_dress_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_52df8ddf0a7d4067971b0502fddf0d2c.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_317b2f2684da432689857a1aa2d50f44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7452530-056a-4317-93b3-e5228590b8bb/what_is_non_probability_sampling.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_7849071978f44813b929b418ef1480f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f251a032-b4e7-45ec-94da-c6cc36a56786/vifakijevafizerit.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_6bd86ea416064adda67a7691cbe22325.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4491dd50-2559-4b02-8ba9-b76aac941c2f/mercury_outboard_repair_manual_free_download.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_be1c369cb016488b86db39c7a7ec084a.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_ddfb75ed611d4044a55b7b66b4af1ef1.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_43c3f5ddaa7c48ed829afec078825f7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7a6d5d-0e4e-4df1-9064-2da64354dc1a/72997351011.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_b5ff92f8d4b7413f89fdee6834a2fdf9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa22c580-7427-4136-8557-cd21b6a268c3/queer_phenomenology_orientations_objects_others.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_949827f7c0ae4b7ba77797d615b97d0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56c1cdd-d0eb-42c2-9281-7a46678e2f06/blackshirts_and_reds_michael_parenti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280c0bb6-580a-41d6-9494-da1aa60602fc/dixie_chopper_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6afe834-aa31-4a75-a841-32f3dadc3865/vekipu.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_64487a6b10ea4d90b57cb062d2c29de6.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5404 bytes
SHA-256: 89414fe8654439ef7122e98dd6062aaf2cdc73a5b71895cb5e8e98adb4c78db4
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 16868 bytes
SHA-256: 4327cd1e5582172b948a6f7678f3a917bd994828e7f897990bf9952af641b9b4

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