Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4ea35d74eefe4f…

MALICIOUS

PDF

83.1 KB Created: 2021-05-27 07:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ea09fb22a36ccd08e19917787601b7 SHA-1: 1837e376bc73e04c143a37f825ce0c7c3980e79e SHA-256: 1f4ea35d74eefe4fe85531268ea699d0a6846b2079c284e7a06ad01c8a55b98a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to boost SEO for the term 'diep.io hack apk download'. One of the primary external URIs, https://jumiwimov.ru/strik?utm_term=diep.io+hack+apk+download, directly relates to this lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=diep.io+hack+apk+download
    • https://retenosarubus.weebly.com/uploads/1/3/2/6/132695405/723704.pdf
    • https://sipadaguw.weebly.com/uploads/1/3/4/3/134322090/supixim_nexezawo_pikukusabadoz.pdf
    • https://cdn-cms.f-static.net/uploads/4450512/normal_60279d5057622.pdf
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/66cf820c3ab1017.pdf
    • https://melokiziw.weebly.com/uploads/1/3/4/6/134669089/9215013.pdf
    • https://cdn-cms.f-static.net/uploads/4473340/normal_6017ab188aafe.pdf
    • https://cdn-cms.f-static.net/uploads/4409819/normal_606c37b7c4453.pdf
    • https://cdn-cms.f-static.net/uploads/4393883/normal_604a039964c92.pdf
    • https://static.s123-cdn-static.com/uploads/4377377/normal_60064825476d0.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/480409.pdf
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/kabidelegikugo.pdf
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/306290b7c.pdf
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/zotarov_bebufitolad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6da4622f-4ffc-43ed-8a49-58638b394258/veripenagutivavoderoles.pdf
    • https://uploads.strikinglycdn.com/files/7fcad00c-f2ee-4510-bf25-ee5243f119d1/47792074474.pdf
    • https://uploads.strikinglycdn.com/files/c99028e0-0ef6-455e-a697-3ecdf25f44ce/mopaposebakuvij.pdf
    • https://uploads.strikinglycdn.com/files/7fe69644-e2d6-4317-9492-216582ef05c8/12373239740.pdf
    • https://uploads.strikinglycdn.com/files/34edf175-b6d5-4034-b84c-00be06c21d4b/56224543607.pdf
    • https://uploads.strikinglycdn.com/files/062a0ada-c2be-446a-bc10-761d71ac1c4e/18737814611.pdf
    • https://uploads.strikinglycdn.com/files/8e07dd9e-fc27-4497-bb59-0ec9c31b1e98/97466579439.pdf
    • https://uploads.strikinglycdn.com/files/91a8c681-84e9-4264-818f-b9de19f8bfc4/bob_proctor_you_were_born_rich_workbook_free_download.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin
30765433141c325e088544da60ce95c816f0b33f921447cb1fca49be25ed9124
pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5072 bytes
font_01_sfnt_off00010363.bin
38234a65bcf85a340f8b6bae639723bcfd3b8ffed398203cc157aa6a76e21216
pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 11236 bytes
font_02_sfnt_off00012914.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 16204 bytes