Malicious PDF — malware analysis report

Static analysis result for SHA-256 67793efcca877ec8…

MALICIOUS

PDF

69.3 KB Created: 2021-02-05 06:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3ab053dc7857cb9a81827c9c720f6143 SHA-1: 599c92faab8e96956b09ac4f0dd3c25b4c744f2d SHA-256: 67793efcca877ec893ef74f5381b0d7f27d1f366ed429e37ca185c28183ca1e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous external URIs pointing to potentially malicious domains, suggesting an intent to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://seumenha.ru/wb?keyword=future%20perfect%20tense%20exercises%20pdf PDF link annotation
    • https://devivevapidon.weebly.com/uploads/1/3/4/7/134711806/7ddf3895ba6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388824/normal_5feb089d30e3c.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/mugodubewukuxituroleg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5ff1fb2425beb.pdfIn PDF document text
    • http://9gusevshop.space/schumacher_battery_charger_user_guidedilsz.pdfIn PDF document text
    • http://nutupiwerumad.66ghz.com/33943929484.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/19971113138znar.pdfIn PDF document text
    • https://terunutu.weebly.com/uploads/1/3/5/3/135319236/pusozu.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/tixojo.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/wezeti_kexag_gojegoguwa_xirujane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419204/normal_5fdd3f246b0b2.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/fatebagilufawisapim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ninazarila/sopepogivusomenoxemuvuz.pdfIn PDF document text
    • http://vezexosewomex.epizy.com/wbjeeb._nic._in_answer_key_2019.pdfIn PDF document text
    • http://renawexit.epizy.com/46523105623.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/41407414615.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/wakosuvodegolexave.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 4928 bytes
SHA-256: 2cb32cc14538edf6e649d4bc77513c46c39d783205e62d72b7d261c9b7747f06
font_01_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 2032 bytes
SHA-256: a353d780432e2b00cfb66a80c35b9dcc3a4a91f3f7b41884fed931c80fd5ae89
font_02_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10364 bytes
SHA-256: 93b85dbff3ca3869a18d8204c03d682cf8652b4c5e1b5aa9dd8c302b98bc25b4

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