Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d3d681e4a3df98…

MALICIOUS

PDF

91.8 KB Created: 2021-03-15 16:28:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec882df091da0ec92f01f1db64e17fe SHA-1: bd1de19fcb7323638ec4f7ab23e4cd3705f6b08c SHA-256: 21d3d681e4a3df9870de913ab0444cf144347491a3994dc4f766aa2df68c5927
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=sprinkle+island+apk+download+full+game
    • https://cdn.sqhk.co/jelivapizivo/2hcJShh/home_master_cooking_game_mod_apk.pdf
    • http://damapilob.iblogger.org/86596512567.pdf
    • http://gosologesegob.iblogger.org/kadidavugusasojoga.pdf
    • http://fonomujolatuv.22web.org/electric_tankless_water_heater_installation_guide.pdf
    • https://cdn.sqhk.co/nomazotesi/jcifjg8/city_racing_bike_simulator.pdf
    • https://cdn.sqhk.co/voravaxa/igixogc/amnesia_memories_shin_guide.pdf
    • https://cdn.sqhk.co/rozesivotix/iayNhf1/playstation_5_console_target.pdf
    • http://you-bestshop.xyz/formal_email_format_for_jobx2k8o.pdf
    • http://dkblogin-de.best/is_the_arc_trainer_good_for_legsxtytv.pdf
    • https://cdn.sqhk.co/pufowuvikij/dgfhfih/live_tv_app_for_firestick_2019.pdf
    • http://zewamiluwevegif.22web.org/memobalixerenag.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xonaxevetaf/guloxobuki.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_690eb4377ea747ed9742fcd1932f7a16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e65743c9-e22c-4ab8-9a6f-fe9ccf8d3a06/kufekatafarulaxedogozexa.pdf
    • http://tujefozumuresul.epizy.com/645867263.pdf
    • https://s3.amazonaws.com/pilazi/nstemi_guidelines_executive_summary.pdf
    • https://uploads.strikinglycdn.com/files/7c3653c7-f9df-4506-902a-2dbcd4255883/i_too_sing_america_tone.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1f1908a55766456a8fb8f807c6e5b416.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3289bd2c-3ccc-4956-98f7-b66e38153472/53283909065.pdf
    • https://uploads.strikinglycdn.com/files/69c2315d-d827-49ff-8294-8e1db3166729/what_is_the_fundamental_trigonometric_identity.pdf
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_48cdfcf9c8ed4dc8b36aeceb20c8ac49.pdf?index=true
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_61163f134b504ca6a7e5e3d2ffae2e83.pdf?index=true
    • 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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010756.bin
231c0afc48d5393d68fa3fecd0e04f4c5603a6e73bb3ae8b99f06c1e72026365		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10756 13172 bytes
font_00_sfnt_off0000f4fe.bin
ae1c86c511765b0d641f7ed89599818c9d55a9f8ebe702a240115ec1bc2f7442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 5420 bytes
font_02_sfnt_off00012cc1.bin
448d251cf4c4284d85fdbcb8c2a1a50b832f4b7b6f1b68583dce26cf72b29d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 11328 bytes
font_03_sfnt_off0001531d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1531D 4324 bytes

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