Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bdb67ef853636d…

MALICIOUS

PDF

82.1 KB Created: 2021-02-27 21:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e72d00c2831df0c10b568fc4c598e7e2 SHA-1: 40e339809b94bf512f5c6b63525d6f7a900f2ee4 SHA-256: 79bdb67ef853636d92bdb60be399bf7b0f9db115f41da0fed58efd90977e4aea
196 Risk Score

Malware Insights

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

This PDF document contains a high number of embedded links to external domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_LINK_FARM' and 'PDF_SUSPICIOUS_LINK_LURE' heuristics indicate a deliberate attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://golowaki.ru/123?utm_term=samsung+galaxy+s5+mini+zoom+camera+error
    • http://organize.shop/fubikigabeiex7m.pdf
    • http://mx50off.pro/nelson_grade_11_biology_textbookdg52k.pdf
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/398411d330993a.pdf
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/d99926010df807.pdf
    • https://cdn.sqhk.co/sugifila/u6icjhN/98079853836.pdf
    • http://kuxafazugof.iblogger.org/jekazufaf.pdf
    • http://domavera.ru/use_of_shall_and_will5i3z5.pdf
    • http://medyahanem.com/the_lord_of_opium_free4uh60.pdf
    • http://loginwithfb.site/39932407345k61ro.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/61edcc5.pdf
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/9873457.pdf
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/0545bf1d4908.pdf
    • https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/9159832.pdf
    • http://sfr-webmail.com/gegomojubigotiminufeduwufzg6fn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiworetaganufo.epizy.com/xamenagetoxiluzove.pdf
    • http://xuwomotibinifen.rf.gd/muscle_definition_workout_routines.pdf
    • http://vatilibudavelit.rf.gd/computer_certificate_design_format.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_off000103b0.bin
4de2ad6980e0dca47e30f61c1548657275a04b933353c0421d17ad0ffb507932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 5564 bytes
font_01_sfnt_off0001169f.bin
6348bb978e44a62c5a0a67fa95b32838d958606a6a471cf1079efa6e9f041c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 10708 bytes

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