Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7691f5307ae4ef8…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 17:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 148ba158082557f314f6c9b7f55cb9d7 SHA-1: 113c2545f554294ed47ddc8505eb9ab647499b8c SHA-256: c7691f5307ae4ef84c3de2f7a0ed97796afc9a0d0961ca09c2fff927cd4a5b1b
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://golowaki.ru/123?utm_term=jeep+cherokee+auto+to+manual+transmission+swap PDF link annotation
    • http://bumumapa.mypressonline.com/84751592578.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/aghgjgd/alodinia_causas.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gfQesP2/86156365501.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/aspiracion_de_secreciones_bronquiales_procedimiento.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/783615.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/bavivofusevi.pdfIn PDF document text
    • http://vinnipoh.fun/jopimevivupejigufifizonuyvrrb.pdfIn PDF document text
    • https://cdn.sqhk.co/vekazedivipi/gfDu6hj/the_best_baby_monitor_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/eja3jij/61582208088.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/fifejifobezizivopub.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/a163ca.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/22637686264.pdfIn PDF document text
    • http://mastericy-chistoty.ru/zilomixuziwazozin63l4f.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/how_to_make_a_financial_statements.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/6129750.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/qhdtwEc/rumble_fish_book_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/strategic_marketing_process_ppt.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/53269716882.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/42897205077.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_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 5320 bytes
SHA-256: 901709526a8e1622eacd91f3112820bf6ade37404f38a507a4faf5eae78df427
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10440 bytes
SHA-256: 84228aa6ae316216aa2fae1b5c5541d50804651c26d396578161f5effcef90c7

Open this report in the interactive analyzer, or submit your own file for analysis.