Malicious PDF — malware analysis report

Static analysis result for SHA-256 749805e3c537541e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 16:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a082038eeb108d897bb75e1a53e89a2 SHA-1: 23bc8b09c45c99dbf0891f5c3790fef024af0d99 SHA-256: 749805e3c537541e0c2a3355311ef9c84d3c7d3ccb0206c3c1ed73cb24b66e8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of embedded external links, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://zajinet.ru/strik?utm_term=aa+prayers+audio
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5fed824d62bb4.pdf
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/tovaxuzi-nenukojufogip-jogula.pdf
    • https://zapedumukovig.weebly.com/uploads/1/3/0/7/130775012/dbe831fb32e86c.pdf
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/1998773.pdf
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/9297178.pdf
    • https://cdn-cms.f-static.net/uploads/4502245/normal_6038756772c1c.pdf
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fdda098d9bce.pdf
    • https://kojaxinepizoju.weebly.com/uploads/1/3/1/8/131856409/mijaludojagebe.pdf
    • https://mugoxebasupube.weebly.com/uploads/1/3/3/9/133999984/5464616.pdf
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fcd79a88ec30.pdf
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/4486848.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/b3ddc669d5278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/janodojivi/41685031431.pdf
    • https://uploads.strikinglycdn.com/files/92b26310-3dd1-4102-9cde-8c2f6b256473/60977610704.pdf
    • https://s3.amazonaws.com/mudurixo/tedudijaxuso.pdf
    • https://uploads.strikinglycdn.com/files/fba84042-08c6-4d56-9579-94e9be7836d2/soundpeats_q30_not_turning_on.pdf
    • https://uploads.strikinglycdn.com/files/6992190c-0001-433c-9822-8378b666bfd9/ea_sports_game_face_ufc_2_ps4.pdf
    • https://uploads.strikinglycdn.com/files/55b3ccf9-8181-4af2-bc9c-7f657a23aa4c/wetovexukidevofodit.pdf
    • https://s3.amazonaws.com/bogijexu/inhibit_adventitious_root_formation.pdf
    • https://s3.amazonaws.com/vuraradaso/mathematica_excel_link.pdf
    • https://s3.amazonaws.com/rawesaragegugar/pokemon_blazed_glazed_1._3.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_off0000ec46.bin
fc4e944f9ae3aa0fbfbe8ce9cd2268e2b86c63600155fb98b66d7eed57ad73b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5012 bytes
font_01_sfnt_off0000fd6a.bin
b85d2185613b02398c1a9e50e64621be07383148d2e184c8ac882cde5b82dbf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 11300 bytes

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