Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95bc775c4a9133e…

MALICIOUS

PDF

61.1 KB Created: 2020-12-16 17:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca594bb3fd77b3f39cf4ffa67be067cd SHA-1: 150bf0c321398bf7484c0a303d1920c0cde9943e SHA-256: d95bc775c4a9133ebaffb7353b6311ccb77ddaef42d5afa8de97aa8f18a6617f
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. An embedded URI points to a suspicious domain, traffking.ru, which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/strik?utm_term=physics+principles+and+problems+answers+chapter+20
    • https://cdn-cms.f-static.net/uploads/4392666/normal_5f98322e3e5c6.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5fadace239f3b.pdf
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5f933375eac86.pdf
    • https://cdn-cms.f-static.net/uploads/4424630/normal_5fa8381e2ea0a.pdf
    • https://cdn-cms.f-static.net/uploads/4412161/normal_5f9ba2da2f4ab.pdf
    • https://cdn-cms.f-static.net/uploads/4492580/normal_5fc138518fefc.pdf
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5fa9b8a23e0d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c07f2a47-b421-4aa0-bfab-5040ed97db7e/little_drummer_boy_sheet_music_in_c.pdf
    • https://uploads.strikinglycdn.com/files/f85c23a7-c7a6-4519-8b3a-23644d1046c0/portland_kindergarten_writing_units.pdf
    • https://s3.amazonaws.com/xisakazelelinim/roblox_exploit_executor_2020.pdf
    • https://uploads.strikinglycdn.com/files/e24b1803-10f1-4c56-9c63-6394b09a13db/my_god_is_the_sun_tab.pdf
    • https://uploads.strikinglycdn.com/files/2d57789d-6f58-453c-b2f1-0bddafbf6618/jazebagepufew.pdf
    • https://uploads.strikinglycdn.com/files/83aadbc9-e1e4-460b-9d99-b9af772c6a0e/97039566607.pdf
    • https://uploads.strikinglycdn.com/files/9b106696-9ec1-4cbb-9efa-9af8a98314e1/koxofowimavesufa.pdf
    • https://s3.amazonaws.com/boxalewijim/usda_report_on_food_insecurity.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_off0000b1c8.bin
768d0e54494e54e1a0006fc81e09dbdec69c8eef7129f792f024e072a0f6230e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 5924 bytes
font_01_sfnt_off0000c5da.bin
5b1c9ca0e19d5aaf5971ea63973a8437da32556450fdaf7a437755f288ea8fff
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 10012 bytes