Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5c4bf78b54bc4a…

MALICIOUS

PDF

72.6 KB Created: 2021-03-24 14:38:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5feb6322b387d4c6c57e92f8ed51839f SHA-1: be567c59500cb8e2f817923442b3b65c98d59d90 SHA-256: 6d5c4bf78b54bc4a183ca4959f683f4e890ba35799381b04f1acfef3c683da79
96 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=photo+quiz+answers+level+4'. The document body, though heavily obfuscated, suggests a lure related to "Photo quiz answers level 4". This combination indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=photo+quiz+answers+level+4
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff080f6943d4.pdf
    • https://cdn-cms.f-static.net/uploads/4476416/normal_605350b17a22c.pdf
    • https://cdn-cms.f-static.net/uploads/4458137/normal_600cb6620de01.pdf
    • https://cdn-cms.f-static.net/uploads/4406776/normal_6041ea57f3e8d.pdf
    • https://cdn-cms.f-static.net/uploads/4495390/normal_603e73c235bb0.pdf
    • https://cdn-cms.f-static.net/uploads/4493578/normal_6038eec2d9e4c.pdf
    • https://cdn-cms.f-static.net/uploads/4367310/normal_602c4b9744803.pdf
    • http://kavelizopepi.mywebcommunity.org/mortal_engines_book_age_rating.pdf
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fca6eafc7955.pdf
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6040e93ad07da.pdf
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5feb942bee5b3.pdf
    • http://riwotivadejud.sportsontheweb.net/3689489873.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_31170782d4394df8bb274a7407bc3cde.pdf?index=true
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_c08e1dea1eee497b9323d9be7a11329c.pdf?index=true
    • https://s3.amazonaws.com/napoledunadigo/how_to_do_work_cited_page_in_apa_format.pdf
    • https://s3.amazonaws.com/xutomoxu/83326395869.pdf
    • https://s3.amazonaws.com/fefurorobumi/11611923523.pdf
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_70809e759ef34972a15491b4c19232ed.pdf?index=true
    • https://1f7d5645-f7ff-4e8a-adf1-68ee3026c1e2.filesusr.com/ugd/54fa57_f7d027d0f12f4a2aa955f5b474d07804.pdf?index=true
    • 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_off0000de1f.bin
2f0bf13652ab6337283413281ea8e15b9390e85ef6b473e9f60f2436618e8d98
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 5192 bytes
font_01_sfnt_off0000efe8.bin
a2e11fe2689efb0be763a94850a1ce0d0fd8fd01aef55b4952b4ecdaf66cb4e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10600 bytes