Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb906511a9b65232…

MALICIOUS

PDF

72.7 KB Created: 2021-04-04 13:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe1b155bb1f67c1efd920efb2e1e5d03 SHA-1: 81436c76d1639da080bae07b24c4ab97e8c661bc SHA-256: cb906511a9b65232217883f5471c09e4a8707e8c9b1890893a10a2b8649a298c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to 'worksheet answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=charges+of+ions+worksheet+answers
    • http://itawegan.space/weponukogesokukorio0iad.pdf
    • https://cdn.sqhk.co/raxoxawupej/g7Vg5hb/16686178527.pdf
    • http://refarebadas.22web.org/44087477380.pdf
    • http://devgm.design/what_are_the_25_rules_of_civilityveu4m.pdf
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/bazamifadosalugabo.pdf
    • https://static.s123-cdn-static.com/uploads/4389586/normal_5ff0d1cf1c800.pdf
    • https://cdn-cms.f-static.net/uploads/4446499/normal_606944681e26c.pdf
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fd635be241c7.pdf
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff6cfdf2fa51.pdf
    • http://xorabawik.medianewsonline.com/how_to_clean_the_wolf_steam_oven.pdf
    • http://vezdesami.ru/cambridge_graph_theory_example_sheets45ko4.pdf
    • https://cdn.sqhk.co/moserusoba/ieHiiCe/65965819333.pdf
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/80b08.pdf
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/54d10.pdf
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/bulogirej-zokilova-sixetiwurivuti.pdf
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/753b1.pdf
    • http://diwokaxojizo.iblogger.org/pawesuboma.pdf
    • https://cdn-cms.f-static.net/uploads/4374368/normal_6063a39dc7f7b.pdf
    • http://visionnew.xyz/tulavefumixomatolip23bsp.pdf
    • http://pagebake.com/dave_ramsey_debt_snowball_toolqdilf.pdf
    • http://finomimetafix.sportsontheweb.net/acuerdos_de_paz_en_colombia.pdf
    • https://cdn.sqhk.co/nujizeres/hjjjjXH/torn_acl_surgery_time.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zavalexudar.epizy.com/lutasumusipived.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_off0000e11c.bin
82d3083b00f61775d8e5c10e41c0873814ed15c0dffe841468bdfa66a60c1cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 5056 bytes
font_01_sfnt_off0000f25e.bin
c539e94921d23f77907572e3e665ba009c55d1c0c730866999bee5c5265141fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 10192 bytes

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