Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29b415f478e4f54…

MALICIOUS

PDF

73.0 KB Created: 2021-03-04 12:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c168241d0e4031d6f9e4c52cd71a980b SHA-1: 9c8c516bf634cf359ac83b88895ba224822f2ab5 SHA-256: d29b415f478e4f5437042bfd73c745a45786160b4b47ce8105eba4797009bc42
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/123?utm_term=toshiba+satellite+l750%252Fl755+drivers+windows+7+64+bit PDF link annotation
    • http://daating19.site/how_can_you_go_to_jail_in_monopolynm9s5.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/XWiAwie/47163363918.pdfIn PDF document text
    • http://bcipreactivaperu.com/xikivigukifivinabugo2ch0l.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/LigyghE/conduct_this_train_action_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/bjisigk/14775737781.pdfIn PDF document text
    • http://piredvizhnik.com/aadhaar_card_printing_software_free3its2.pdfIn PDF document text
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/tezipa-tesejo.pdfIn PDF document text
    • http://wownatural.fun/bimble_s_bucket9mdtj.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/cYajj1A/better_portal_mod_mcpe.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/id8jeNO/pbs_parents_play_learn.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/3704b8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/f1Ojcie/60365606342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedatedemokuju.epizy.com/11456316857.pdfIn PDF document text
    • http://sejozewixexoba.rf.gd/queen_elizabeth_guards_uniform.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/manualidades_de_navidad_con_fieltro.pdfIn PDF document text
    • http://botesuni.epizy.com/java_swing_radio_button_change_listener.pdfIn PDF document text
    • http://losisotudek.epizy.com/best_interview_questions_and_answers.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/zimojoluvusudenikivokag.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 5776 bytes
SHA-256: e2d591e4725c137ca478649fd1f597be57994ee055085c81d52cf02cf3097018
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 12380 bytes
SHA-256: a151b91e5ef629d1c349b0490ab6437643f1d44aa250bb3229a22b62b36b0c48

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