Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4a52858a2e3ffd…

MALICIOUS

PDF

88.9 KB Created: 2021-04-01 21:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae35eeec02a8108b2bc71161851eb3dd SHA-1: ee23820b397e1a86daf74c574b9b38e0050f61ae SHA-256: 8a4a52858a2e3ffdf41ae074542c5a08b75bab00715d62b28d744ec231426d74
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=womens+formal+gowns+australia
    • http://qqkaxes.xyz/download_video_from_browser_ioss5kkf.pdf
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/judilefevediz-pokezaxozo-durofu.pdf
    • http://vebifitapex.mypressonline.com/here_comes_the_sun_fingerstyle_tab.pdf
    • https://cdn-cms.f-static.net/uploads/4369519/normal_6026f6d6ecd15.pdf
    • http://vejuwetuk.mypressonline.com/bobuginaxajomexatenel.pdf
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/danofumivuvanafuna.pdf
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/goziraduteribo.pdf
    • http://warowusavi.mywebcommunity.org/ariens_snowblower_manual_824.pdf
    • http://form-lnstagramverifiedbadges.com/zimujakokukh8ow1.pdf
    • http://conicppjry.bid/93556219107qtgqu.pdf
    • http://coins24h.com/ayrshire_housing_application_formzyavb.pdf
    • https://cdn-cms.f-static.net/uploads/4482228/normal_605c586aec2bf.pdf
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5ff7603cd232b.pdf
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/dexikosixut.pdf
    • https://cdn-cms.f-static.net/uploads/4419826/normal_6041921cf3831.pdf
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/lofomabodub.pdf
    • https://cdn-cms.f-static.net/uploads/4449996/normal_5fd296ec56718.pdf
    • http://tanijijud.sportsontheweb.net/how_to_drain_kenmore_600_series_washer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dubanexotokegel.myartsonline.com/comment_fusionner_2_fichiers_sur_mac.pdf
    • http://nazowovemozugiv.myartsonline.com/93030031929.pdf
    • http://wikukodukoja.onlinewebshop.net/who_pays_for_transgender_surgery.pdf
    • http://tujupifirafadus.myartsonline.com/application_letter_examples_for_job.pdf
    • http://sarutufasiko.atwebpages.com/kolilatijusava.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_off0001035e.bin
02a55758bd01dfe79e9e1c78b0da1bfdc1ba769342df46719d6bd10bdd7990ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 5192 bytes
font_01_sfnt_off00011506.bin
00ab001ccf3e257b6c622bac6ed0c0fa0e9c4f9fd54ab8182dbf8705c2d31e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 12800 bytes
font_02_sfnt_off00013f32.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 16204 bytes

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