Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3a67716896e82e…

MALICIOUS

PDF

76.2 KB Created: 2021-04-28 02:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf622baa2ebaa52df5db9cd120293239 SHA-1: d5fabd4a8d1589cd6e0369a8607b4b3a6e62a3f5 SHA-256: 7e3a67716896e82e914a527946c962de29f8ddce26a04e08fac936f483777bae
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://ponafet.ru/strik?utm_term=e46+automatic+transmission+fluid+type
    • http://gikufozufuze.22web.org/movies_bollywood_hd_free.pdf
    • http://muluwusive.22web.org/bgv_form_format.pdf
    • https://fimezerix.weebly.com/uploads/1/3/4/4/134478386/14114c0374002e.pdf
    • http://bamejudodenor.iblogger.org/resident_evil_biohazard_game_for_android.pdf
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fca80b29e4b5.pdf
    • https://xegafifa.weebly.com/uploads/1/3/0/7/130776616/tomal.pdf
    • https://cdn-cms.f-static.net/uploads/4482215/normal_604ccf527d4e7.pdf
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/futirusejolabujoku.pdf
    • https://cdn-cms.f-static.net/uploads/4384634/normal_6043904bbf7ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/joterige/who_makes_insignia_fire_tv.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_d703795acd9e44878ad3a7b29e3757f1.pdf?index=true
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_a4e0bb4129104646a8bf4a8b8ed27ba4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc7d6834-544d-4230-a09d-8cdf66bfa20b/debumoliwitofisa.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/46314627190.pdf
    • https://uploads.strikinglycdn.com/files/09a02ba9-a752-49d8-822c-9ae67a4b2093/bonoferolowa.pdf
    • https://uploads.strikinglycdn.com/files/15312e28-4c2d-4595-b1b1-ed177daae863/is_adobe_premiere_rush_app_free.pdf
    • https://uploads.strikinglycdn.com/files/20278dbd-4d45-47d2-a4d9-e8901614a347/tumenuwapamat.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_27533bb827364f228a005aa6c2163e01.pdf?index=true
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_6cd4a31e42714223b9dea9e5a0700f19.pdf?index=true
    • https://s3.amazonaws.com/xamapebonijos/how_long_is_the_blind_side_movie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd5.bin
e8601b0dd0c168d5f901866ac6b63fcb5914b45863ae1a875b81e227839a0f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 5604 bytes
font_01_sfnt_off0000fee4.bin
36f812ac34cdce184374589d4e99625294463071eb34bd66f44bec91dc6b7016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 10704 bytes

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