Malicious PDF — malware analysis report

Static analysis result for SHA-256 9990ffe51d943e10…

MALICIOUS

PDF

72.3 KB Created: 2021-03-02 19:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e55ef8758f6ed65306f103d38cfb78d6 SHA-1: 1fb464b0684ad5d158a6525a5c896b7a054ae3a9 SHA-256: 9990ffe51d943e10b62cb8656ead7028703f03c9728ac274326d0624adadcda1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://golowaki.ru/strik?utm_term=is+badger+poo+dangerous+to+dogs PDF link annotation
    • http://creamwalls.online/arris_surfboard_sb6183_user_manualryyln.pdfIn PDF document text
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/3eca801.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/divazivov_tezimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_602c62f193d05.pdfIn PDF document text
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/jubizoxupok_bimedugoruxodun_tafodep_nupazunuzezuwum.pdfIn PDF document text
    • https://cdn.sqhk.co/gunumiku/JjekvwI/dreamer_supertramp_lyrics_traducida.pdfIn PDF document text
    • http://lifegirls.site/how_to_change_liftmaster_garage_door_keypad_batterycvlr6.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hjdgg6X/ragerexowudo.pdfIn PDF document text
    • http://digtalcaliper09.xyz/satarelibororo4vwne.pdfIn PDF document text
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/tofuzakegupeguti.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/fgcZgfS/92408533045.pdfIn PDF document text
    • http://shmelev.pro/collection_of_250_decrypted_3ds_roms0bwuo.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/napejaxosinages/65453374453.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/28992480828.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_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 5172 bytes
SHA-256: 0670fa8dfdd8f1d5c719bcfe65d75e0d5c17526e88a508720e6638d7c628faec
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 9792 bytes
SHA-256: 71b3af76121ba5391d5f5a769f1c970e3c1d9f9a7c7a95cfe8fac2c49bb28a05