Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe13c2e0ff71f739…

MALICIOUS

PDF

75.1 KB Created: 2021-02-19 09:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2e8f1c9f10f19127a31390ebe0bd42b SHA-1: d7f494aeb25b18093f309773bf63152c2a508582 SHA-256: fe13c2e0ff71f739081bcece875d2bf80da007380b682fe4e578a2ff8d43ab54
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=zebra+gk420d+printer+skipping+labels PDF link annotation
    • https://cdn.sqhk.co/xemugugafot/tgfMih9/lopapalefopukonirizuto.pdfIn PDF document text
    • http://belkwigs.com/the_crusades_through_arab_eyes_amin_maaloufy2yjl.pdfIn PDF document text
    • http://onlyforyou.space/925529299589s2i9.pdfIn PDF document text
    • http://cpskras.website/memagemivuriwilujizotk63ut.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/ifgpjb0/53069380698.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/e6gtbpo/likee_video_editor_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/ichciUz/40060084431.pdfIn PDF document text
    • http://sepimositasosu.iblogger.org/5750600349.pdfIn PDF document text
    • http://espaceabone.com/sigajoperudakoteopv2v.pdfIn PDF document text
    • http://mandarins.space/13468774840qfeqp.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/fa2902062f11.pdfIn PDF document text
    • http://copyright-rules-help.com/46833126060ekfw2.pdfIn PDF document text
    • http://mon-cmso.best/problme_association_avec_le_serveur_freebox_en_cours7k00y.pdfIn PDF document text
    • http://tomogorman.com/bijafumujirarigabewiksa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojiwifi.epizy.com/class_of_heroes_2_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/adjectives_and_adverbs_worksheets_4th_grade.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/divabujobafodeboxubi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/budesonida_formoterol_precio_similares.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/gavire.pdfIn 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_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 5652 bytes
SHA-256: 9d9aeb0635990855de29d10d4bf23def61886a86ae76112b0bee069c75da78ff
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 11464 bytes
SHA-256: 833934adb84e6190bde1e9b85f4fe4e2d757483ebd0e8e514fee8480e7de231b

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