Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a31007fec49213…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 23:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a1fcb4537d8b911770949e24bc549a9 SHA-1: 47ed0ba7781d5d992b054b4d6f21e4b7e9ed02f2 SHA-256: 62a31007fec49213db8a1f2109d54cb26b0ebad46443ebe06c2b95812bd5f571
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a primary suspicious URL pointing to zajinet.ru, likely serving as a lure for phishing or malware delivery. The PDF's structure and the presence of numerous links suggest it functions as a link farm, a common tactic for distributing malicious content.

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://zajinet.ru/strik?utm_term=echo+leaf+blower+gutter+cleaner+attachment
    • http://fakixigulidol.mywebcommunity.org/descargar_death_note_castellano_netflix.pdf
    • http://lixorajepidil.mygamesonline.org/94179817763.pdf
    • http://sonifakeki.22web.org/minecraft_xbox_one_brewing_guide.pdf
    • http://zunuruxeguxifi.mygamesonline.org/kowasavavufowepemari.pdf
    • http://lenijer.22web.org/petsafe_rechargeable_collar_not_working.pdf
    • http://liwurivosopap.medianewsonline.com/gesexix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://saxodanokijaj.atwebpages.com/xulejukuxafovazefobo.pdf
    • https://s3.amazonaws.com/gezizefefififa/telecharger_bouteflika_une_imposture_algrienne_gratuit.pdf
    • http://resilasijajatil.myartsonline.com/american_gods_free.pdf
    • http://zudosikewemer.epizy.com/bang_bang_nancy_sinatra_piano_sheet_music.pdf
    • http://ralirajuz.atwebpages.com/xokofifipejabobifulunuka.pdf
    • http://vajexakatozezal.epizy.com/51011864326.pdf
    • http://xalenefinuj.rf.gd/mole_ratio_lab_answers.pdf
    • http://dinoxisajuz.rf.gd/tajugipupinew.pdf
    • https://s3.amazonaws.com/vapite/46724949967.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de30.bin
55a00df31377f9cdf8381702974737be80b40fd86240164dc21af0710f620442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 5140 bytes
font_01_sfnt_off0000ef97.bin
b73b90776749f0499948c49934252e3f9e152469cf87072ef142927e78115f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10520 bytes
font_02_sfnt_off00011356.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 4324 bytes

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