Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab692d938aa50b88…

MALICIOUS

PDF

73.1 KB Created: 2021-03-23 08:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5702720779d457ed1f4fbbe2a55f42 SHA-1: e27c50676ea7b962473287b2f0808fdcd389a73d SHA-256: ab692d938aa50b88fefbf8fd3cefe0109c75f053cb88d0af748e553e12df5165
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to disposable domains, many with UTM parameters, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation of PDF viewers to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=chennai+express+full+movie++tamilyogi
    • http://wow50.pro/182104244489jffx.pdf
    • https://cdn.sqhk.co/pabelewexo/jmOcIkV/bully_anniversary_edition_apk_mod_android.pdf
    • http://premiumpornclips.com/tazisibetedaberufaduvadirlnb5e.pdf
    • http://lenemoloj.22web.org/beguponaxareruf.pdf
    • http://igme.site/doodle_army_3_god_mod_apkfbff3.pdf
    • http://dudoxanudito.scienceontheweb.net/81607202464.pdf
    • http://fastgetme.online/jabixifovizijobakunuui16z.pdf
    • https://cdn.sqhk.co/numavagoko/jZTgeje/fifa_beach_soccer_world_cup_final_time.pdf
    • http://fodamibokaf.66ghz.com/bulleting_in_excel_sheet.pdf
    • https://cdn.sqhk.co/diwewiduvaz/iaMhfYY/80301905424.pdf
    • https://cdn.sqhk.co/mazinenik/xjhUWIw/betuwuwepelimazebirovi.pdf
    • http://limevekobo.iblogger.org/12th_marksheet_online_gujarat_board.pdf
    • http://mediaverifiedbadge.com/the_organic_chemistry_of_drug_design_and_drug_action_downloadvfkzg.pdf
    • http://jurogiriwizezaw.22web.org/how_to_reset_comcast.net_password.pdf
    • http://labifovejes.mypressonline.com/29394540043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://madojizekikozor.epizy.com/commercial_lease_agreement_template.pdf
    • http://posijibanif.epizy.com/gizudivanoverojibixu.pdf
    • http://gubadif.myartsonline.com/budomi.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/22456891820.pdf
    • https://s3.amazonaws.com/jebokizez/29092977162.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/lifijapepuso.pdf
    • http://gafodix.myartsonline.com/enumeration_of_microorganisms.pdf
    • http://moseligukunevuz.epizy.com/informe_de_laboratorio_de_caida_libre.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_off0000e145.bin
148285c942802fde9daead86a74b86451f1acb4d9c8979bbefde1bd0f7b504d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 5448 bytes
font_01_sfnt_off0000f3b7.bin
393d93987b1c56861c86b08437bdf2e9201b3742615ff8d18359a81b40505c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10220 bytes

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