Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9debc6751f5b84b…

MALICIOUS

PDF

78.1 KB Created: 2021-05-12 09:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80519e32c7dac779582216a536a72bfa SHA-1: ef3deae3e6383852bd6a4281ccb4d7ce62811c5f SHA-256: d9debc6751f5b84bd73dc104e6e365e01974ff57de1345dac8ec4a5620ac24ba
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 domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wb?keyword=how%20to%20wrap%20gifts%20without%20box
    • http://zonitupupafof.sportsontheweb.net/52538571134.pdf
    • http://fepaporipevari.mypressonline.com/xipifepuzakiloxizededolit.pdf
    • http://januvasiw.22web.org/classroom_objects_matching_worksheets.pdf
    • http://robugipunebib.mygamesonline.org/rokitenuvax.pdf
    • https://cdn.sqhk.co/vunalogivefu/phaIogc/hi_tech_cooking_equipment.pdf
    • http://greatholl.com/fokomasuvdpd5.pdf
    • http://jojazinex.mygamesonline.org/bertrand_russell_skeptical_essays.pdf
    • https://cdn.sqhk.co/davunosedepa/tBvDiak/73564456001.pdf
    • http://instapodarok.site/wuzikivatosiz5rjlh.pdf
    • http://smartcreditscore.info/bopomupizomozoxawamewy3qe.pdf
    • http://gepexoliv.medianewsonline.com/what_causes_high_thyroid_stimulating_hormone_levels.pdf
    • http://1xbet-sportstavki.fun/luxigekusaxazomirowotelafcnuo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b9f8f4b4-a985-4e5d-b3e6-abe76321119e/teloretesirusepibos.pdf
    • http://rupiroliwon.epizy.com/lavediko.pdf
    • http://rovafitazilom.epizy.com/sanyo_eneloop_hr-_3utga_datasheet.pdf
    • http://repogadobuwiri.epizy.com/bagidugegusutekenoti.pdf
    • https://uploads.strikinglycdn.com/files/67762d1c-fd23-4848-8b2a-cb402ed929e2/how_to_write_ten_thousand_in_numbers.pdf
    • http://goxajuvudabo.rf.gd/53432975144.pdf
    • https://uploads.strikinglycdn.com/files/2497e921-4835-4f16-88d4-4421227ae03e/14931624199.pdf
    • https://uploads.strikinglycdn.com/files/6fc352ee-4154-4b9d-bd7c-9a3051b9bd3d/2545168934.pdf
    • http://goguvero.epizy.com/whistle_podu_song_ringtone.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_off0000f347.bin
17b11867e1e2be1a09f439e95906a4f7d63015035e5a2a4aa7c5508f3c22e778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 5392 bytes
font_01_sfnt_off000105b2.bin
e63dd2ae4398252e3c866d577246822e38aa59f7246c8eb4b56192b9b22c3756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10996 bytes

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