Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc49851ba9528b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 17:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9512fda917904de280e0d2210cb9a9 SHA-1: 101f91b384b57f6bbcf8e8fedf9b5582f3ef38d4 SHA-256: ecfc49851ba9528b4bf02846690c7b65a3c6c84f410f9a4def118ab5f9cd7438
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes 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://leonvi.ru/wix?keyword=kalamazoo+river+kayak+rental
    • https://cdn-cms.f-static.net/uploads/4369317/normal_601ce9ec98271.pdf
    • https://cdn.sqhk.co/didowolikex/gjd6hb9/susabamodagikigujejaxag.pdf
    • http://milanomoda.site/nerisumamogabexumep3geek.pdf
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff9d2e3b1cb4.pdf
    • https://static.s123-cdn-static.com/uploads/4410217/normal_6002a8240f14f.pdf
    • https://cdn.sqhk.co/xobanozizesa/iBgihig/homeschooling_in_pakistan.pdf
    • https://cdn.sqhk.co/romemanir/jghjcgj/mario_game_gallery_soundboard.pdf
    • https://cdn.sqhk.co/tatidukigag/B4O6Cih/jiruno.pdf
    • https://cdn-cms.f-static.net/uploads/4446650/normal_601285085bb55.pdf
    • https://static.s123-cdn-static.com/uploads/4459057/normal_600256413a467.pdf
    • https://static.s123-cdn-static.com/uploads/4446162/normal_5ffb119363c40.pdf
    • http://ideal-it.fun/dymo_labelwriter_450_twin_turbo_address_labels3aobm.pdf
    • https://cdn.sqhk.co/pidodalatip/z86ijuU/gears_of_war_2_xbox_360_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4417118/normal_6033afcea029b.pdf
    • https://cdn-cms.f-static.net/uploads/4389568/normal_603ff9614429b.pdf
    • http://diniguwoweka.iblogger.org/sql_performance_explained_epub.pdf
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fd96ed5dbff9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://roniderekatitim.rf.gd/xafinabusazasewobopib.pdf
    • http://xajuvezovaguze.rf.gd/sinutiwarazazuwesoguvowu.pdf
    • http://kugilib.rf.gd/bogevusabidinilofome.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec48.bin
b80d30a1e6d6c9d1bbb21338854d91ac12445500bdd7fa15c6fd9d0c43e715a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 4688 bytes
font_01_sfnt_off0000fc24.bin
d568dc83e97a3b5f1f19e61c798765adbb129019093533419607e0ab8f1a9b30
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 11008 bytes
font_02_sfnt_off000121cf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 4324 bytes