Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac6502b121d1bae…

MALICIOUS

PDF

91.9 KB Created: 2021-03-14 04:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c8bdbdaeb0b3a29bdf43b2c82a596f8 SHA-1: d0a3fdeb8ec7e06a5fb9a9742156d8f7e8f08a41 SHA-256: 8ac6502b121d1baeb0b709e23d5f92fc8bf01787fbb1cd033a68e667a05e1447
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous URLs, many hosted on disposable domains, designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Risc pipeline in computer architecture pdf', likely to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=risc+pipeline+in+computer+architecture+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465012/normal_6022595cb952a.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/g8rlfwl/vsco_mod_apk_v76.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/67YYgdo/77324452148.pdfIn PDF document text
    • http://beststudent.space/tuxaburogikatezaduki8zbd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5ff26556a89a0.pdfIn PDF document text
    • http://steelsho1.club/semuxizodiresepujapunamkdo3.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/15255802288.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/gAham8v/samurai_sword_for_sale_melbourne.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/63625159302.pdfIn PDF document text
    • http://lbaranaydin.com/fujutozom9b75.pdfIn PDF document text
    • http://electorat.org/public_relations_definitiondc6wj.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/vDkggaN/mhsaa_football_championships_2019_channel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_60340cefb8073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/tularojopexux.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/57301778809.pdfIn PDF document text
    • http://zinuforonubas.rf.gd/nuzudekebinamifesod.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/99250501603.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/88486845810.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/39158673525.pdfIn PDF document text
    • http://bexatati.epizy.com/longman_dictionary_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/al-_fajr_azan_and_alarm_clock_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 5404 bytes
SHA-256: 632c27c1e56e22bcaa3947be6be7b5e7ad35e33c23fc576d456344499d5bedda
font_01_sfnt_off00013b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 11452 bytes
SHA-256: 5b40fbc63b62406cbe75469650a9289a5b2c07763df3d1543b4571e4c4fcc253

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