Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c9da7f9378814e…

MALICIOUS

PDF

100.1 KB Created: 2021-03-22 11:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cae6e00c8aac02e04158d2937c978d7 SHA-1: 766861453f0421238afc6b7c3e19530e2abdd558 SHA-256: a2c9da7f9378814e26da3ecec30847a2757772bd72ebcaae44909630664405c9
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'livestock farming pdf' and the wkhtmltopdf application, likely serving as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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-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://leonvi.ru/award?keyword=livestock+farming+pdf
    • https://cdn.sqhk.co/lexaxemiji/ji4hjmf/28073580750.pdf
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/2815843.pdf
    • https://cdn-cms.f-static.net/uploads/4454421/normal_5fea155a942ba.pdf
    • https://kopepadozuko.weebly.com/uploads/1/3/4/5/134505487/75a3f.pdf
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/1f27d5008d1c.pdf
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fd046c1ab689.pdf
    • http://rasudilikid.mywebcommunity.org/oral_b_triumph_professional_care_toothbrush_heads.pdf
    • http://viwavidif.getenjoyment.net/bajegu.pdf
    • http://stakingyfi.com/what_do_3_beeps_mean_on_ps47v1ks.pdf
    • http://jepegupunu.mygamesonline.org/benim_hocam_ayt_tarih_video_ders_notlar.pdf
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/zepawikolod_fukiroroweli_ronokenaja_xepopanogi.pdf
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/f10299b176c45.pdf
    • https://cdn.sqhk.co/muxigatatini/khfGvWV/runescape_old_school_grand_exchange.pdf
    • http://it50save.info/kamojavadazozipasagarexsd7s9.pdf
    • http://dupamineni.medianewsonline.com/how_many_square_bales_in_a_round_bale_of_straw.pdf
    • http://endi-itali.space/les_miserables_musical_castle_on_a_cloudt4t2c.pdf
    • http://tazanup.mypressonline.com/65515748060.pdf
    • https://cdn.sqhk.co/ranetixeba/pvFhbjh/tiny_calendar_daily_schedule_and_agenda_planner.pdf
    • https://cdn.sqhk.co/xonarewu/jbJDkRG/83995433525.pdf
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/gipitonu_minibataxesi_wigevizokile_vuxufedamuvore.pdf
    • http://psylath.com/zulejipamebuwedukejftkrs.pdf
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/3687649.pdf
    • https://cdn.sqhk.co/bulixanejad/ajhoPiA/re_equalizer_10_band_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013840.bin
f020d6c7e27d234f2825d6554cd29536474466bbcc9d4367438c071f6bdb30c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 5296 bytes
font_01_sfnt_off00014a2e.bin
42e1d2fabc6bb5dd85ba0f6b30f49db140f1e1aa79b743a23dd5396fb2541cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2E 11916 bytes
font_02_sfnt_off000172d5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172D5 4324 bytes

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