Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7992f01751f2a8…

MALICIOUS

PDF

90.4 KB Created: 2021-02-06 13:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2d53e47ba64238d2f2830bd298ef96e6 SHA-1: 8258038b3ebd9f86f70dbe66e3b5b707cd1f30d3 SHA-256: bc7992f01751f2a86987767b15b4eb20f6c7816aff275c1e1a8327312774e772
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=free+bird+solo+tab+pdf PDF link annotation
    • http://winoraama.fun/disney_itinerary_template7zpeu.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/Igfjcha/logo_quiz_expert_level_7_answers.pdfIn PDF document text
    • http://podcard2020.site/keneruxaropozatewolopugr98dw.pdfIn PDF document text
    • http://kismyketio.com/gupolawiwivegufelidokujpr5lk.pdfIn PDF document text
    • http://everydays.space/top_anime_er_app_for_android7uzym.pdfIn PDF document text
    • http://vas-rem.ru/attention_please_song_mp43b9w6.pdfIn PDF document text
    • http://vovality.club/zobawogupopimexozadq57b.pdfIn PDF document text
    • http://flathead.us/55756345634miufe.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/AggyDEr/knighthood_list_2016.pdfIn PDF document text
    • http://onlinesos.tech/859954240044vjqz.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/fuijhha/feparotor.pdfIn PDF document text
    • http://kyponnik.online/printable_inspirational_quotes_black_and_whitecpv0d.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/vunudotoziwemif.pdfIn PDF document text
    • https://xudorelaguf.weebly.com/uploads/1/3/0/8/130813521/nerukanigebi.pdfIn PDF document text
    • http://yourdesk.website/gotez3bhcz.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/5754298.pdfIn PDF document text
    • https://nazawerud.weebly.com/uploads/1/3/4/3/134353719/7266900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/latumafo.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/bipap_full_form_in_medical.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/bulk_sms_software_pakistan_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/affichage_obligatoire_en_entreprise.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_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 5132 bytes
SHA-256: cea8bb10ea11921e8ec8f7961b6fe1b33747a1edca7f7fce04af8c8425e9b5ed
font_01_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 12588 bytes
SHA-256: e3534a5f37000835a77c7e67062e4f5f1c633be5a07fd4709e6c27887e488234

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