Malicious PDF — malware analysis report

Static analysis result for SHA-256 573a3eae71d0eb6c…

MALICIOUS

PDF

77.6 KB Created: 2021-03-09 13:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dda1c5f3a42fd9c2608da9cad75d60f6 SHA-1: e3772ffbd5b856ab854607770189b601ecd2e9a8 SHA-256: 573a3eae71d0eb6c4e37fbd55d345ea3fde7434ac98a40dd928412bbcda3e812
126 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 or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to a 'cookie policy text template', which is a common pretext for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=cookie+policy+text+template
    • http://mujoxoluvisukid.getenjoyment.net/bpsc_mains_geography_question_paper_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fc56fd52a251.pdf
    • https://cdn.sqhk.co/wareberefiz/whbAAgc/pengertian_arbitrase.pdf
    • http://mowisadewojapu.22web.org/woxaxubuwovonumoxewoxa.pdf
    • http://kigaruzolalo.mypressonline.com/digital_photography_definition_computer.pdf
    • http://rolovibabes.22web.org/how_to_write_book_title_in_mla.pdf
    • http://bovewowi.iblogger.org/taveselifejemisisugima.pdf
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdfb79279bfd.pdf
    • https://cdn-cms.f-static.net/uploads/4380675/normal_6032bb546e0cc.pdf
    • http://moperala.iblogger.org/hp_laserjet_1320n_printer_driver_for_windows_8_64_bit.pdf
    • http://tajoraf.22web.org/jogagadogitabilesatediru.pdf
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fe5072db9baf.pdf
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6012fae5a6124.pdf
    • https://cdn.sqhk.co/gesaxamadew/whcmhiB/40593106724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fepetixapokurob.myartsonline.com/zowafimipukifoderenuki.pdf
    • http://sizikukot.epizy.com/how_long_is_the_magic_mountain.pdf
    • http://sovewegupafipiw.rf.gd/free_bubble_gum_machine_template.pdf
    • http://bugibek.rf.gd/ffxiv_crafting_leveling_guide_1-_80.pdf
    • http://vobikeretuwof.atwebpages.com/82919054362.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_off0000f4cf.bin
3793236707f21d2b2da8453d2df3bc317ed59b27a0da06958c2fb85a82e8a4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 4944 bytes
font_01_sfnt_off000105a1.bin
a9cfe5d60f062a26fcda26bf6bdbdf4419b42c4f73b294ace8dd9c98ad335e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10416 bytes

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