Malicious PDF — malware analysis report

Static analysis result for SHA-256 5950c6ed75041da9…

MALICIOUS

PDF

84.4 KB Created: 2021-02-12 06:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01f46707fbdbdc4d5f993988bed37ed3 SHA-1: 80ae30d7da503a5d66b8f6787bd8da82370d6f26 SHA-256: 5950c6ed75041da93845db755e0dd5179a37866588f338b95b27dfa39a2538c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

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://leonvi.ru/wb?keyword=adverb%20or%20adjective%20prepositional%20phrase%20worksheet PDF link annotation
    • http://bigmagazin.xyz/wilisosusesijazuwamipewpjkmr.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/jgaChf6/extreme_off_road_rally_racing_driver_mod_apk.pdfIn PDF document text
    • http://tevalevas.22web.org/dpe_applicant_copy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_60192cdca3616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fdae12c96df7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5ff9c0ec32fa5.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/jahbhgg/rocket_launcher_pole_holders.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/Q9inijl/tiremamejevemikizexi.pdfIn PDF document text
    • http://sibuvre.com/7997001235tksbn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_60239928ea7f9.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/ifjgjbB/47798913390.pdfIn PDF document text
    • http://bet-info.ru/baxifuve58ms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bukufam.epizy.com/bible_verse_wallpaper_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/jipusuduzajazurozu.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/burglary_proof.pdfIn PDF document text
    • http://putojoner.rf.gd/charles_proxy_certificate_ios.pdfIn PDF document text
    • http://bogasupi.rf.gd/marvel_strike_force_apk_mod_ios.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_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 5580 bytes
SHA-256: ad771ba2ed4fab1a8392d3ca725c4b55fec6434f19fce0d580f0b7e23a817385
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10072 bytes
SHA-256: 7056cfbf04347199edf6ef3e9dcce97e391464a9ddd97c2ccbfd3ae33a4ceb4a

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