Malicious PDF — malware analysis report

Static analysis result for SHA-256 9854b6f8c8896e24…

MALICIOUS

PDF

94.8 KB Created: 2021-04-27 23:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65857ae0ff940eee6175215e37843dc6 SHA-1: 66e497559970b18906ff39cf9f0fcb467d523346 SHA-256: 9854b6f8c8896e24fef0758dbf6338e3bc17fa3e6f0fede3a22e50df1085bdc4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to iPhone resets, which is a common tactic for phishing or directing users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=how+to+do+a+hard+reset+on+iphone+xr
    • http://zejirejajedudu.getenjoyment.net/gesukifovomeb.pdf
    • https://cdn.sqhk.co/kukisigafumi/iNig9N9/sorefarofulezajubikajumef.pdf
    • http://rofuxipof.mywebcommunity.org/nulimu.pdf
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fe81e788e511.pdf
    • https://cdn-cms.f-static.net/uploads/4382192/normal_601432ee192dc.pdf
    • https://wulukisogexoz.weebly.com/uploads/1/3/1/4/131438059/visotitaxukip.pdf
    • http://fafabil.getenjoyment.net/25988794069.pdf
    • http://xaraxag.mypressonline.com/65470018177.pdf
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fcfa0e7c63a4.pdf
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5feb161c5714b.pdf
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/pomemej.pdf
    • https://cdn-cms.f-static.net/uploads/4390684/normal_605fd71c386a6.pdf
    • http://wirobigi.medianewsonline.com/xegenol.pdf
    • https://cdn.sqhk.co/xewafazuk/4GjjhhW/best_deals_for_tv_black_friday_2018.pdf
    • https://cdn.sqhk.co/gujuvizaja/dhajaSs/comprehensive_credit_reporting_system.pdf
    • https://cdn-cms.f-static.net/uploads/4464077/normal_60384ccc7d975.pdf
    • https://tonirifiw.weebly.com/uploads/1/3/4/4/134468227/negewevo.pdf
    • https://cdn.sqhk.co/komajekolino/jjehi6T/20444568853.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jujobope.atwebpages.com/rosanulakipup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c9e.bin
50350638db53cc9473ff310e1d5590b364463bfa945201062b7aee9b643b4322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 2908 bytes
font_01_sfnt_off000126ff.bin
e26d39d252e5cf4342e041669eaa33bb46a8e348e99269061690fb853ae11998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 4924 bytes
font_02_sfnt_off000137c7.bin
96301e87a4310ffe94b829aa690e662c018a33235047bfb2a12ffc04a97e6b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 11600 bytes
font_03_sfnt_off00015f50.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F50 4324 bytes

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