Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1f776747bb6cd5…

MALICIOUS

PDF

81.8 KB Created: 2021-04-30 07:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d00bc1887cdae2e42edc74dc5a3cf5df SHA-1: 355d02ed8795cac0e4ddc4383018e93c15a537c7 SHA-256: 1d1f776747bb6cd51e9fe3047e2b497331e8f8c42c337cdc7c9a39a8ef7c22f9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, appears to be a lure related to common search queries, aiming to trick users into clicking malicious links.

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://xezojetit.ru/strik?utm_term=why+is+my+jeep+grand+cherokee+stalling
    • https://cdn.sqhk.co/nomazotesi/gjXWjcz/76860533997.pdf
    • http://lalashoppen.online/159284321664c1tb.pdf
    • https://cdn.sqhk.co/fabokofe/fqjkMyE/pico_island_weather_december.pdf
    • http://ig-mediateam.net/carmina_burana_choral_score7436v.pdf
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fdf399f53d68.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fd132f29f2ba.pdf
    • http://sujabupinoda.scienceontheweb.net/bapejexumix.pdf
    • https://cdn.sqhk.co/lewoxiguj/hZigij7/joplin_weather_radar.pdf
    • https://cdn-cms.f-static.net/uploads/4368467/normal_60434d037f141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4f6ef09c-e012-4dc2-bb8e-6098defa9a7f/landlording_on_autopilot.pdf
    • https://uploads.strikinglycdn.com/files/06f10ae7-d55b-4c35-977c-e77deb2d24ac/80985995370.pdf
    • http://zeluwerilosa.epizy.com/how_to_record_dividends_paid_in_quickbooks_online.pdf
    • http://fipokaf.epizy.com/sipujitef.pdf
    • https://uploads.strikinglycdn.com/files/f40914b2-1cbc-4504-bf2b-39ce1a9aac7a/35687823862.pdf
    • http://kajemirari.rf.gd/38452595509.pdf
    • http://zugepoguj.onlinewebshop.net/orchestra_layout.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_off0000ee6c.bin
316eef5ec727536bf482a87abc94ec28efd43dcdb198808381903c1f2cb73fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 5528 bytes
font_01_sfnt_off0001011e.bin
f6ab90b1c81bf1762d907dc9b8d0c7fef076fcfd4dfe230e246c0878989a9c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 13060 bytes
font_02_sfnt_off00012bcb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 4324 bytes

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