Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb92f56a8138cf3…

MALICIOUS

PDF

94.5 KB Created: 2021-05-15 12:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40bf14f2ec36a54e86a130ae834e76b9 SHA-1: 2e71d22baf5cc44a6d7ac80298f5bbc73d05a0cf SHA-256: dfb92f56a8138cf3620d8254f0a40c341808abc752c9d3407740627a3e930bfa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to 'ponafet.ru/strik', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of many external links implies an attempt to redirect the user to malicious content.

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=inkscape+1.0+trace+bitmap+not+working
    • https://cdn-cms.f-static.net/uploads/4449172/normal_6064e23426a3a.pdf
    • http://dazedovepiza.iblogger.org/ff14_ifrit_zenit_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4481157/normal_60675b28e45af.pdf
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fed9012c2414.pdf
    • https://cdn-cms.f-static.net/uploads/4410433/normal_606e853eaac0b.pdf
    • https://cdn-cms.f-static.net/uploads/4413707/normal_605a3c72c48da.pdf
    • https://cdn-cms.f-static.net/uploads/4459059/normal_604f2d7085bbe.pdf
    • https://cdn-cms.f-static.net/uploads/4422161/normal_600a14de01543.pdf
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ffa550cc5bc1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_7be5a78c15a348c389e226a5e7aa75ec.pdf?index=true
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_7af626ffe43a4e44baf999d167ec023f.pdf?index=true
    • http://zavufomagug.rf.gd/fapojunagikujomebatokaso.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_bd1d9df6c33e480aabf57d641ed333c0.pdf?index=true
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_262f6ff15faf4c5080d8d2fa68d3a67a.pdf?index=true
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_0adbae397dc7404ca2183e9de807b751.pdf?index=true
    • http://jonufinufezo.epizy.com/lugopawatik.pdf
    • http://kovudefimure.rf.gd/beramagededi.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_off000131d4.bin
e130db8862a26f08aed7375b16b8c7e4f4da2799156dc368a43323b06ab40ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 5680 bytes
font_01_sfnt_off00014533.bin
e9e4adc723ed2ea15e097a60c42784f4fd82b43c6ae09208de11e8ee10d940ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 11804 bytes

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