Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef716fc2bba6d7ba…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 11:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e3346e36d25ff840616b2d90ba2a4f SHA-1: 7be94a22c4b76d94c14f66496f5b450a4c0c3648 SHA-256: ef716fc2bba6d7ba85f033d6e08b406fc4851cea5d93072989329df04b0e18e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm or a phishing operation. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure itself is used to host and distribute links to other potentially malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=which+oster+blender+is+the+best
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/5712579.pdf
    • https://cdn.sqhk.co/sirezozere/zSjihde/konegatawogixenezon.pdf
    • https://nonililuwadev.weebly.com/uploads/1/3/4/3/134354571/fogarasa.pdf
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/120d4.pdf
    • https://bogobesupagal.weebly.com/uploads/1/3/0/7/130775478/rapezumubov_bejova_nugafufeg.pdf
    • https://cdn.sqhk.co/pubodegosog/ihTtgfk/dizomuzawevapif.pdf
    • https://cdn.sqhk.co/nilesatu/ajjyjdU/jijedavejiriwunaxalagijip.pdf
    • http://dapunoxideran.iblogger.org/acetone_uses.pdf
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/lugusitetumuvuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/moduxanakuri/manut.pdf
    • http://talavapupaniv.rf.gd/plc_programming_tutorial_for_beginners.pdf
    • https://s3.amazonaws.com/mexesazaxasa/73810239074.pdf
    • http://timavutiziv.epizy.com/editor_video_gratis_pc.pdf
    • http://kesojavutuv.epizy.com/wonodozepuxovifebukaza.pdf
    • https://s3.amazonaws.com/busutafitufe/bssc._bih._nic._in_admit_card_2017.pdf
    • https://s3.amazonaws.com/bidurudilidujug/lomizanebi.pdf
    • http://barirenuvekesup.epizy.com/tratamiento_retinopatia_del_prematuro.pdf
    • https://s3.amazonaws.com/wekibik/mobogenie_for_windows_8.pdf
    • https://s3.amazonaws.com/masevewi/65626484172.pdf
    • https://s3.amazonaws.com/defipedibe/para_que_es_un_agente_de_ventas.pdf
    • https://s3.amazonaws.com/kobivimelelo/dell_2407wfp_release_date.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_off0000f04e.bin
7118386fb7cae8634f216d93c0972a751ae60d994918c7d64854fd35ade6ad95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 4968 bytes
font_01_sfnt_off0001013a.bin
feae20f14ccbed1803e35c604a8f87b1a89ece787246a6d1dcd6f5ed7ef736bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10984 bytes

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