Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadf42cd4df9bf4a…

MALICIOUS

PDF

79.7 KB Created: 2021-05-31 22:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd372258b28508148f7a74999dddf74f SHA-1: 99b6375dfc93526b49f5bfd54dc49b8f37abd256 SHA-256: dadf42cd4df9bf4aad87cbfad7d4f2fb0f0b76539319544b583c3c3d7be45ed1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/pbw?utm_term=how+to+update+audi+a7+mmi
    • https://cdn-cms.f-static.net/uploads/4423133/normal_6061ab7c44557.pdf
    • https://cdn-cms.f-static.net/uploads/4528915/normal_602429eecf547.pdf
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/kawarufuwozo.pdf
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/f7f4840cd85.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_6037ce5627a94.pdf
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6046313d23534.pdf
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/tekugurizesufa.pdf
    • https://jukuxalubena.weebly.com/uploads/1/3/1/4/131453985/vutux.pdf
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6021443b155db.pdf
    • https://winalefumigis.weebly.com/uploads/1/3/1/4/131437210/wuteridolegerux-kodododawi.pdf
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/dibamubibakup-patolufo-vodupufunudis.pdf
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/9403527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7b73e1d4-5300-416b-b48b-2e9744fa0257/28831473419.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144415128/how_to_run_originality_report_in_google_classroom_as_a_teacher.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144423333/22043208785.pdf
    • http://gatasulupu.pbworks.com/f/rajuxovogutaziti.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144421497/la_ltima_oportunidad_carlos_cuauhtmoc_snchez.pdf
    • https://uploads.strikinglycdn.com/files/3f087104-4024-4cfe-9898-3183369f9c7e/kepamebexuxezafat.pdf
    • http://xetibubib.pbworks.com/w/file/fetch/144425430/49670497187.pdf
    • http://zezimin.pbworks.com/f/aye_baysal_genel_beslenme.pdf
    • https://uploads.strikinglycdn.com/files/1f61db23-a20e-42c9-b8cf-86119ea99829/dd_wild_sheep_chase_map.pdf
    • https://uploads.strikinglycdn.com/files/cd912256-a434-4107-b01c-0b4c92abc20c/10493316606.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_off0000e42b.bin
56bdc331c52f9385563c2485e9764ffa760b1de585d8d2748b172734269c7c36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 4708 bytes
font_01_sfnt_off0000f452.bin
1893884168f88dcac562f7a00a7f8b70168a68cfccade9f8a8072a07d5108b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 15772 bytes
font_02_sfnt_off00012335.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 4324 bytes