Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4079b59db8412e1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-04 10:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 49618aa268e5e13e908cab6fc24e5016 SHA-1: 7f8a9a8e5d9f0ea306f90770096f0a4090627180 SHA-256: a4079b59db8412e1ea45d751e47048e56825b126e8391038b8554908f0da7fe1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'Toyota pickup frame replacement', likely a pretext to drive users to malicious sites. The presence of external URIs and link farm characteristics indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=toyota+pickup+frame+replacement PDF link annotation
    • https://cdn.sqhk.co/newupulig/eRjgibp/weather_chicago_october_31_2020.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/79021558169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_600ab0c9472e1.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/sipineniduruw_zitoxep_dekosaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6025895f03f95.pdfIn PDF document text
    • https://wivexisi.weebly.com/uploads/1/3/1/0/131070498/1492990.pdfIn PDF document text
    • http://meetporte.xyz/welozfx6iy.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/bodokam_rugidadorami.pdfIn PDF document text
    • http://carbags.site/gisowunizilimuneragaku03nba.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/XaKthik/murder_us_game_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476767/normal_5ff92be14431c.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/gfifZg8/hashtags_on_instagram_for_art.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/gijaFFF/bubamadozobemipelav.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/nagasawuxekegin5s9v7.pdfIn PDF document text
    • http://titalat.iblogger.org/18473180452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapogexolewiji.epizy.com/exportmodeller._dll_crystal_reports.pdfIn PDF document text
    • http://kevixavi.rf.gd/lekojufudezitabozode.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/polediwobinumetafuna.pdfIn PDF document text
    • http://zijedan.atwebpages.com/what_countries_did_the_iron_curtain_divide.pdfIn PDF document text
    • http://nifimemewiz.epizy.com/46745090503.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_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 5096 bytes
SHA-256: 16506f019c9d8301102feb4e71f34644a1595443d026a307c679ceca01f7f128
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10136 bytes
SHA-256: 399d7c2c7857cb5ebd27c93b33a7768680592cc62b7af759020435ce09a7e9bc

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