Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45a05286880dbf4…

MALICIOUS

PDF

176.4 KB Created: 2021-04-01 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a38ec7aa36f66a20c5a16769aa6c384 SHA-1: 721db5a9db179c4c43f21da5fd5af79809a209cc SHA-256: d45a05286880dbf4183770c2f0c736958e6802e080958b186e9eff1f350230e5
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, indicating a likely attempt to redirect users to potentially malicious websites. The PDF structure and embedded URIs suggest it functions as a link farm, possibly for phishing or distributing further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=urban+agriculture+definition+pdf PDF link annotation
    • http://podcard2020.site/assistive_touch_ios_screen_recorder_mod_apkqqw8t.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/ciaeuoz/40385555645.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jajjNnU/horizon_fitness_treadmill_7._0.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hhRp59E/65087334546.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/can_you_use_lazy_spa_hot_tub_in_wintera24ky.pdfIn PDF document text
    • http://auto-agents.space/chronicles_of_narnia_movies_in_orderm29ja.pdfIn PDF document text
    • http://ulekschool.online/704391066234cwia.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/haIhaBy/tuner_gstrings_free_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hgdidhj/8500111558.pdfIn PDF document text
    • http://vuvubul.iblogger.org/learn_to_write_arabic_alphabet.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/je69jaB/63160323658.pdfIn PDF document text
    • http://mainsale.pro/birthday_card_template_word_20075wmoj.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Jjcgixg/24167718215.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/GhdYkge/57150115681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_82002ce8139745d9bc98847ffd3e555b.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_fb4c691d53fe4f909f8f7631f1998638.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_a8460274ef6647679fa540bbe06a2d23.pdf?index=trueIn PDF document text
    • http://lopitidelawexe.rf.gd/panasonic_th_42px60u_power_supply_board.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000264ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264AB 5276 bytes
SHA-256: d532c1e8f913b2278df6fdbc5fcf5db230d24d261fb7bd45256b5cd8ca59a6db
font_01_sfnt_off000276ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x276AD 11156 bytes
SHA-256: d83e9b23db5950521519c436dce318af234d3a0542b15479eb8c9a04013d1cc0
font_02_sfnt_off00029c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C9C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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