Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c46663c35c28317…

MALICIOUS

PDF

72.7 KB Created: 2021-02-17 08:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c85719e1352beb08a70c83c836804679 SHA-1: 5f2630ca2b74b4cb40fffffb67387781de2e32f1 SHA-256: 8c46663c35c283178152ebbae4dc6b2022b4b234247f8490794654f463f183e8
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-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://bologen.ru/wix?keyword=unit+1+worksheet+2+significant+figures+answers+physics PDF link annotation
    • https://cdn.sqhk.co/nowavutu/KBhiFJw/mario_kart_8_user_guide_switch.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/b945b2f974b8.pdfIn PDF document text
    • http://wamawogep.iblogger.org/bike_racer_game_for_pc.pdfIn PDF document text
    • http://losqutoq.online/nopaferokaxadawula0og.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/jdhbjbz/43352538871.pdfIn PDF document text
    • http://devojesan.iblogger.org/aadat_song_sucha_yaar_dj_remix.pdfIn PDF document text
    • http://wei-nmvc.com/4150849525875tib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5fff7a05528b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/gdjghbj/51038344496.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/cggygjX/xirevevibaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_602028e4a03c6.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/gjjccS7/zibibavobepal.pdfIn PDF document text
    • http://gukukoraxolu.iblogger.org/android_pie_root_exploit.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/c9cffa93e1b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesafisuki.epizy.com/my_talking_tom_apk_mod_mega.pdfIn PDF document text
    • http://fabonek.rf.gd/yang_zing_metalfoes_link_format.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/printable_calendar_may_2019.pdfIn PDF document text
    • http://xafonabikox.rf.gd/haad_dataflow_verification_report.pdfIn PDF document text
    • http://tituroxir.rf.gd/juputuwogaxenoniresonaw.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5676 bytes
SHA-256: c6120c4ee54186d7463c15c42c0758427c03d256805dad009e5d53c312fbcd7d
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 10136 bytes
SHA-256: 509ebf0768a5fd453b7debf5e5a0616953811005b622ab53e2d73fc162e2a106