Malicious PDF — malware analysis report

Static analysis result for SHA-256 58beba7fc6293f54…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 17:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac553ec88ea1a94c36a2f78935d400d SHA-1: 7ea555c4a7ee0c124884ec7b89db5a4326e9770b SHA-256: 58beba7fc6293f54b503194088d32cb0921ee009beca0357a50001568278a42b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDFs hosted on S3 buckets, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary malicious URL identified is mezovuduw.ru, which is likely used to serve a second-stage payload or phishing content.

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://mezovuduw.ru/wix?keyword=animal+farm+allegory+worksheet+answers
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/6043370.pdf
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/dudowisokel-minogizi.pdf
    • http://zuvalasit.mypressonline.com/subliminal_seduction_book_cover.pdf
    • https://cdn-cms.f-static.net/uploads/4383807/normal_603c23b37e5f5.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/numonepewubuvus.pdf
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/6253123.pdf
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/5d5e2dd44e.pdf
    • https://cdn-cms.f-static.net/uploads/4474231/normal_604f3e034eb3c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jujojomojemiz/abstract_reasoning_practice_test_1_answers.pdf
    • https://s3.amazonaws.com/ronenitevodo/bufenitikubumafivuz.pdf
    • https://s3.amazonaws.com/rebesudanolo/rokinagogibuxozomanilobo.pdf
    • https://s3.amazonaws.com/muwemivumazulax/gypsophila_planting_guide.pdf
    • https://uploads.strikinglycdn.com/files/39503e4a-924a-46fc-8be3-7b712974802a/65732254317.pdf
    • https://uploads.strikinglycdn.com/files/813a5c1f-2e58-41e8-9f12-329ab4fbdf0c/graphing_quadratic_inequalities_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/c118509a-126d-413d-94b8-349d6ee96d92/14094203814.pdf
    • http://nibopinalilabaj.onlinewebshop.net/23016003641.pdf
    • https://uploads.strikinglycdn.com/files/b5500a12-f787-4345-b485-e3b6e3bfe0e9/acca_march_2021_exam_schedule.pdf
    • https://uploads.strikinglycdn.com/files/13451bbd-def0-41f0-a47f-a02482e60135/crosley_director_cd_recorder_manual.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_off0000ee77.bin
d2889ab72992f8bc5022295fa473522be5d8d5aad5260cf0c284c648c23d5eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5216 bytes
font_01_sfnt_off00010010.bin
45dcb4a8379d826cb5ff3862b69f0d663f31145e09d13576ecd9e4ba05caecd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10460 bytes
font_02_sfnt_off0001237e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 4324 bytes

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