Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ab1f5a1e956bbc…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 07:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae6303e83c1efdd6cd1284fdeb46c1b2 SHA-1: 7d67d2ece0e48e98d60bbb97ef18ab83bc835700 SHA-256: 85ab1f5a1e956bbcf31fbc0ca40d0b1aa7c47a81b55525a90f98f19d8f0aaf4e
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'ponafet.ru', which is suspicious. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into navigating to a potentially harmful external resource, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/award?keyword=addition+word+problems+worksheets+pdf
    • https://cdn-cms.f-static.net/uploads/4454807/normal_6037130b68c44.pdf
    • http://gifagudilul.mypressonline.com/38394275999.pdf
    • http://dipazekonowa.mypressonline.com/how_much_does_it_cost_to_get_scoliosis_surgery.pdf
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5ffba3f543b9f.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_6024b9dce2255.pdf
    • https://cdn-cms.f-static.net/uploads/4490369/normal_602996e475e04.pdf
    • https://cdn-cms.f-static.net/uploads/4450876/normal_603202a41e358.pdf
    • http://ninotekega.mygamesonline.org/transgender_tipping_point.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_3b6631789ed14ac1b69102ad6c9e268e.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_30b6f8a3b9b944219a8aa9fceadce54a.pdf?index=true
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_5d8cc235a64e4c578ab2a97c5904aace.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_3215ebc0217b4f7b9eb69ad2dad34030.pdf?index=true
    • http://rivozisotuwiris.rf.gd/bupoworigaxuwoxi.pdf
    • http://wesatume.atwebpages.com/wovitadizidop.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_47dad5832b4a4204be51aa7aed5b7a11.pdf?index=true
    • http://japamitafixe.myartsonline.com/lexilelopuresobegojuva.pdf
    • http://juborekif.atwebpages.com/how_much_does_a_nutritionist_cost_in_florida.pdf
    • http://petefedugekuk.rf.gd/vijakasazikufa.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_off0000f901.bin
f0a40f5d3ea52c97887b88a0ff2a59fbe073c88d17874e5ea10ab21e57fb90d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 5356 bytes
font_01_sfnt_off00010b1d.bin
8fbe07367d6f551b8ebd8f7ac7b184f62ef1d110239359e9534644f71908c849
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10152 bytes