Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4d3e51130abc03…

MALICIOUS

PDF

74.8 KB Created: 2021-03-01 21:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9f7b478ca7e8826ed6c413851badba4f SHA-1: 7a7e06a5bc0ba19d2655a6848246cf9552ec6dfa SHA-256: dc4d3e51130abc03e77544fae63d976e9a7ef58c2c8cd99fbf2293fd7b7fddae
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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://soxebez.ru/123?utm_term=civil+engineering+materials+pdf+book PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/rubalen.pdfIn PDF document text
    • http://my-favshopg.online/pirate_kings_freehsrq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491175/normal_60038cf624e4d.pdfIn PDF document text
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/bf52d1.pdfIn PDF document text
    • http://ostanni.fun/integral_de_csc4_x_dx6l8zt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5fe99baa0d328.pdfIn PDF document text
    • http://uspeh.icu/50199888097hvk6u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496815/normal_5fce89d84d82c.pdfIn PDF document text
    • http://blablablacar.online/instrumental_lenggang_nyaiyli8h.pdfIn PDF document text
    • http://limons.space/free_video_slideshow_maker_for_youtubedll5t.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/gghjhjh/78948183606.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/jslhigC/2_player_free_kick_games.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/5d5e81.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/sgi7foa/hungry_shark_world_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe7883e8abbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/an_introduction_to_the_profession_of_social_work_5th_edition.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_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 5528 bytes
SHA-256: 3fc571b5c50e563be38e7034c9292f37f2151041af5d7f0a83d0343080474abe
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 9996 bytes
SHA-256: 25c673e72988ec82bb6de770507a0678686c341a198a2e96c8a32c0901824f25

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