Malicious PDF — malware analysis report

Static analysis result for SHA-256 1161a5a5486f0cb0…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 13:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 53c58b82d73dece05c495b738dd773b0 SHA-1: 7946938d369e9f5a63b6f19d75b6fdfbcc6a8f44 SHA-256: 1161a5a5486f0cb063245ca4d1822ee8fd42ccd0b68465e5e62654d65a69aabc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a link farm, directing users to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata related to its creation, but the primary malicious activity is the extensive use of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=flight+simulator+x+steam+edition+requirements PDF link annotation
    • https://nibiromevisike.weebly.com/uploads/1/3/5/2/135299411/jiwofejofurakis.pdfIn PDF document text
    • http://inscarusa.info/how_do_you_install_z_flashing_on_t1_11_sidingyo3h4.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/eVjjhjg/the_trip_to_greece_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fff61b364c1c.pdfIn PDF document text
    • https://bajawefigorega.weebly.com/uploads/1/3/5/3/135339811/8313104.pdfIn PDF document text
    • https://cdn.sqhk.co/nezipumosot/b8Tibhh/blackberry_q10_software_update_10._3.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/los_juegos_del_hambre_sinsajo_parte_2_pelicula_completa_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxasedazu/grgihb4/why_does_cat_play_with_tail.pdfIn PDF document text
    • http://mysteps.online/584094373307mb5r.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/tijos.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/3cff0.pdfIn PDF document text
    • http://laura-egorova.ru/algebra_and_trigonometry_textbook_mcdougal_littell5pv6a.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/d6wigAq/12333069789.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/fgdjhgg/water_parks_open_in_miami_fl.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/51021164384.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/41890018310.pdfIn PDF document text
    • https://cdn.sqhk.co/dovutiwabule/2dbicGu/9430958443.pdfIn PDF document text
    • http://damvglaz1.xyz/3167630075sioew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_604bafbd28770.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ahajejg/kivazojuvukimenonexujupo.pdfIn PDF document text
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/8089575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukilaba.myartsonline.com/2008_jeep_wrangler_sahara_engine_coolant.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_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 5388 bytes
SHA-256: 3f2ed6cd6542524fcd8677c51ba1c9749523676b78961c1f5c80cb797c2b2770
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 10964 bytes
SHA-256: 3b6c71b03ef45b4d12257db273bf44cc4dd4a7d7d2b9effb5df53208bcc62d2c