Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd02dda68a4dd16…

MALICIOUS

PDF

85.1 KB Created: 2021-03-19 04:04:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab8e1571ae7f5233683f7568901e5cc SHA-1: 2a88f3bb21fbf14ed2e359c79bd1074688283534 SHA-256: 4fd02dda68a4dd1672b7c98e832673455c4eee9e37599047823b6239d4789c9c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it may attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=modern+setup+host+has+stopped+working+windows+7
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/firexaxivabolevi.pdf
    • http://nanonewe.scienceontheweb.net/3180486068.pdf
    • https://cdn.sqhk.co/nexetifosam/gZhbigp/mizalopilifoxusogeli.pdf
    • http://kozidozilujivox.getenjoyment.net/23130464722.pdf
    • https://cdn.sqhk.co/vumorumuvogi/Lhfhbjf/knife_tap_beer_bottle_trick.pdf
    • http://supariwepexafat.mywebcommunity.org/medical_embryology_practice_questions.pdf
    • https://cdn.sqhk.co/tuxogafu/cjigf3J/minecraft_2d_multiplayer.pdf
    • https://cdn.sqhk.co/serodozire/cf8ajRA/fofitosavar.pdf
    • https://cdn.sqhk.co/sisowufabo/ohfKKQx/97260634781.pdf
    • https://cdn.sqhk.co/lojibuwe/b0hehgv/alien_swarm_reactive_drop_trainer.pdf
    • https://cdn.sqhk.co/rijakobebux/tujfxXX/neon_chrome_ps4_co_op_games_2018.pdf
    • https://cdn.sqhk.co/zonurubo/fiiTJje/mujogamapedelo.pdf
    • https://cdn.sqhk.co/xolofiwano/ihdiiib/learn_javascript_by_making_games.pdf
    • https://cdn.sqhk.co/litojavu/icdOKjd/emergency_contact_samsung_s8.pdf
    • http://neridofufuleteg.scienceontheweb.net/essential_grammar_in_use_supplementary_exercises_intermediate.pdf
    • https://wuxinafub.weebly.com/uploads/1/3/6/0/136084542/d4aee4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pubopelej/eddie_bauer_xrs_65_convertible_car_seat_expiration.pdf
    • https://s3.amazonaws.com/sefiwegegagu/how_to_connect_canon_pixma_to_airprint.pdf
    • https://s3.amazonaws.com/firigugixujotov/breaking_into_wall_street_questions.pdf
    • https://s3.amazonaws.com/ritoma/31587677895.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f899.bin
19ed96186c465546522bbe467d202e037a05f6325af4a18dbed94fc0424d0f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 5432 bytes
font_01_sfnt_off00010b38.bin
a1c8927072e42ba2d94df6788ef7beb5f45aae997794b8083da2012d56659cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 11156 bytes
font_02_sfnt_off00013198.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 16204 bytes

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