Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fc239daa851877…

MALICIOUS

PDF

79.6 KB Created: 2021-04-22 09:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af14c120798efcd8fbecd18467593e83 SHA-1: 224530e70631b7143608b9d424e46e93f992a562 SHA-256: 52fc239daa8518779f3329c302dd4a59c90c3b01bde0be8ca6c2ae6cb63859e0
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, appears to be a lure related to a product search.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=best+wagner+paint+sprayer+for+fence
    • https://cdn-cms.f-static.net/uploads/4471234/normal_603a5817db01a.pdf
    • http://monijuwoxavup.iblogger.org/puxalogib.pdf
    • https://static.s123-cdn-static.com/uploads/4368977/normal_5fe1c275e62c0.pdf
    • https://cdn-cms.f-static.net/uploads/4366639/normal_601a100a2bb1f.pdf
    • https://cdn-cms.f-static.net/uploads/4369920/normal_606e7d16465fe.pdf
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5ff89e7f306ee.pdf
    • http://nigamenivikuki.iblogger.org/intermediate_accounting_6th_edition_solutions_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_60262821616c7.pdf
    • https://cdn-cms.f-static.net/uploads/4481157/normal_603d4b4e13df7.pdf
    • https://static.s123-cdn-static.com/uploads/4458394/normal_5febfc76d8876.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fatisake/majeselimojinedireweniwod.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_7ab54565b88e4ee49c4f342a0fdff0b6.pdf?index=true
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_13dca25bfbf64a9698e551927036bcb5.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_77d45a7d78004972ad11be30ba3a2940.pdf?index=true
    • http://jijulek.rf.gd/why_guys_disappear_after_intimacy.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/4489711312.pdf
    • http://durapufagumupo.rf.gd/how_to_add_parent_to_class_dojo.pdf
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_7c0623283fb2443f872469e995d61005.pdf?index=true
    • https://s3.amazonaws.com/ratixifo/56196032295.pdf
    • http://terunakef.rf.gd/emoji_stickers_for_messenger_apk.pdf
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_adfb63ce2bd94a37ab5f2352d9ecb7df.pdf?index=true
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_7ee2090f7ec54622a238ec228c064701.pdf?index=true
    • https://s3.amazonaws.com/nodetuxapabara/gekulo.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_off0000fb4d.bin
3e44ad792a655455bf0ed690a6fd02684346133ec8ca0468870468f99e442204		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 5392 bytes
font_01_sfnt_off00010ddf.bin
f7f4b35b5886e6117af22490907368df850576956599532df5f5dd87de3f215e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10240 bytes

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