Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41b4f72334ca4e6…

MALICIOUS

PDF

74.6 KB Created: 2021-03-18 17:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a7535068894acaa3bac61a093e26c1 SHA-1: ea9f0143a6f7a217d7f36860a3a300f6f7277970 SHA-256: c41b4f72334ca4e606d79e29f98750ad921c1d94b0750379ffb4de1705045613
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'kuzutuzo.ru', which is suspicious. The document body, though partially garbled, suggests a lure related to song lyrics, a common tactic for social engineering. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to a malicious site.

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://kuzutuzo.ru/wix?keyword=there%2527s+a+wocket+in+my+pocket+lyrics
    • https://cdn-cms.f-static.net/uploads/4365621/normal_602259bc6b208.pdf
    • https://cdn-cms.f-static.net/uploads/4377908/normal_604fb44a7566c.pdf
    • https://cdn.sqhk.co/xifobariw/ejhgcwa/children_s_woodworking_classes_near_me.pdf
    • https://cdn.sqhk.co/sivefuxonix/jix2Oeh/buzupexapedabavada.pdf
    • https://cdn.sqhk.co/seseniluvus/gcjghf0/40321190955.pdf
    • http://vowujebotoza.mywebcommunity.org/calligraphy_fonts_a_to_z_capital_letters_and_small.pdf
    • http://kixiwogazu.sportsontheweb.net/la_catedral_del_mar_season_2.pdf
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff0c85f99eaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pojoviraxerojo.myartsonline.com/51806450930.pdf
    • https://uploads.strikinglycdn.com/files/57869764-fbe6-455c-8b95-2c280cd3117c/89850884643.pdf
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_80e730b2d20149f090a0c51c397f0e79.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3b2d786-680b-46b0-bf90-381c602672dd/to_eliminate_deferment_abuses_what_did_the_selective_service_system_do.pdf
    • https://uploads.strikinglycdn.com/files/ebf0f841-5b78-490c-8cd6-e8bd802317e8/ginovoxolejexaje.pdf
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_230858cd1e9c4adba5199974b2c2d25b.pdf?index=true
    • https://s3.amazonaws.com/jopomodilamego/43972223018.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_7cb83489687545eca18f96da91668826.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_5837afcace6a4d2db76e92ea3d33e0d2.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_09aabba42db444e281d5066746fdb1b3.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/bestwap_bhojpuri_video_song_2017.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_off0000e5d9.bin
a74abc8037cf03caeedbca5f033fe5014be54e72fd4d40287d6aa33b623a994a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5416 bytes
font_01_sfnt_off0000f838.bin
7836177c3f35aabb61e1618eab135188545190b875f2c28e7eb92b2cfd53c93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 10832 bytes

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