Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1420b9f4f55b97…

MALICIOUS

PDF

84.3 KB Created: 2021-02-15 14:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 336d9cd8c3f103fb9060f84ff9c9073c SHA-1: 21252e8e0c4a88e6c983ec9413dce1c48b1ed746 SHA-256: ce1420b9f4f55b97d2f932efddfe28c8f606525b5924f663067896bb5c5950e8
96 Risk Score

Malware Insights

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

The PDF file contains a URL that directs users to download a VPN APK file, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=pia+vpn+apk+file
    • http://asia.kiwi/41456678807b3o6.pdf
    • http://bivisurat.22web.org/76566394167.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_60210d12b3bbd.pdf
    • https://cdn-cms.f-static.net/uploads/4451365/normal_6019847bd8c4f.pdf
    • http://noncomform.space/twin_bed_cotton_sheet_sets8gimv.pdf
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5ffeb9fde6bef.pdf
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5ff21575d5b0a.pdf
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5fc8b078f0d6e.pdf
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce61cc43c2f.pdf
    • http://trendmobile.ru/7820832671oz1ja.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_60129a9095944.pdf
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd652ab0d0d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tubupokus.rf.gd/best_android_call_blockers_2019.pdf
    • http://mexesumofiruvaf.rf.gd/baltarusijos_ambasada_vilniuje_informacija.pdf
    • http://fofepiroxazu.epizy.com/zowiregolinomuzozejumek.pdf
    • https://s3.amazonaws.com/bakoloj/chef_de_partie_cv_template.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd87.bin
424cc84b04a97f62a6281c3551b292a3061f0edb8f81fbf664c607aae410f759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 4344 bytes
font_01_sfnt_off0000ec42.bin
72497b7c094bd4cf2b526aa447af1c53589145ae92150af8823d149931ebf8e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 3352 bytes
font_02_sfnt_off0000fa22.bin
6d3e395ee1c1714898eb91124ca227ed33170c00798f975aebe514613029138c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 10996 bytes
font_03_sfnt_off00011fff.bin
d25787a4c26d5dfe11954a191e1a78b06a4864afc6c230ccab670610fb8eef4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16204 bytes
font_04_sfnt_off00013556.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 4324 bytes

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