Malicious PDF — malware analysis report

Static analysis result for SHA-256 f582832fe7c8d097…

MALICIOUS

PDF

79.2 KB Created: 2021-04-07 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58adc12aa89bb9410e53e85a8c7b18f SHA-1: 778327834680320de872971ace5e9d8e4581c87e SHA-256: f582832fe7c8d0970f98a72d6b7a6b1c305b30e7ee040d511f5e29ed39a2d322
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/wix?keyword=%25D1%2582%25D0%25B5%25D0%25BA%25D1%2581%25D1%2582%25D0%25BE%25D0%25B2%25D1%258B%25D0%25B9+%25D1%2580%25D0%25B5%25D0%25B4%25D0%25B0%25D0%25BA%25D1%2582%25D0%25BE%25D1%2580+%25D0%25BE%25D0%25BD%25D0%25BB%25D0%25B0%25D0%25B9%25D0%25BD+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC
    • https://cdn.sqhk.co/lojadisexudo/hhiid5R/samsung_gallery_frame_tv.pdf
    • https://cdn.sqhk.co/xudogafu/cLiiTih/z390_aorus_master_hackintosh_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4452169/normal_602ca9488a4d7.pdf
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5ff3d1f101e3f.pdf
    • https://titapogesasoja.weebly.com/uploads/1/3/1/3/131380181/godujuwexil.pdf
    • https://static.s123-cdn-static.com/uploads/4467561/normal_6000213b2d425.pdf
    • https://cdn-cms.f-static.net/uploads/4381321/normal_6068701c7e429.pdf
    • https://cdn.sqhk.co/fuvopone/fhh07jg/crossword_mysteries_2020.pdf
    • https://cdn.sqhk.co/lulufebexefe/rYhddTH/power_warriors_11._5_apk_unlimited_coins_download.pdf
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/zuvoxodinipo.pdf
    • http://wrestling-mma.com/62708129699q4cv5.pdf
    • https://cdn.sqhk.co/vakanaju/g0hyWhe/zaginizusuvaxilutipar.pdf
    • http://verifiedbadge-lnstagram.com/82026012383fiqxm.pdf
    • http://meetly.space/how_to_count_calories_for_my_dog9cts1.pdf
    • http://bestunew.xyz/concordancia_strong_espaolhio2z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wamatasamegu/akalicious_mama_ka_sibongile.pdf
    • https://s3.amazonaws.com/sesafefanulokam/rizixoxokixekasesafajizi.pdf
    • https://s3.amazonaws.com/naxozelozude/what_if_you_roll_doubles_and_go_to_jail.pdf
    • https://s3.amazonaws.com/vuzufexarevima/blades_of_brim_game_for_pc.pdf
    • https://s3.amazonaws.com/divexikav/dipegisebufufe.pdf
    • https://s3.amazonaws.com/bewibiwat/74613375160.pdf
    • https://s3.amazonaws.com/tunenijexe/adobe_illustrator_cc_2021_release_date.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/55450376253.pdf
    • https://s3.amazonaws.com/petubapizo/14980260038.pdf
    • https://s3.amazonaws.com/juvosi/betheme_tutorial.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_off0000ea47.bin
e5fed42f199fedc9ba428a91ade8a457d90e219ea50b24ee8529caf055adcf2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 5724 bytes
font_01_sfnt_off0000fd64.bin
32b991cd80e2d839ffa5b6315db822ba0b85c46856811b36765a2ff8b017e39c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 15048 bytes

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