Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44843bccb5d303a…

MALICIOUS

PDF

182.3 KB Created: 2021-04-08 08:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fc92f4806db1516ac07c77bed1e0cb1b SHA-1: 58543c8d5050f9a13aa5da6e3ff2343da4f5c4e1 SHA-256: c44843bccb5d303af7bf273d9d03e32766d4c66e3c0d38eb63ad327b315caa99
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 0.9964

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://gimoguvi.ru/strik?utm_term=free+download+fifty+shades+darker+as+told+by+christian PDF link annotation
    • http://acupofjacob.com/how_to_check_my_work_schedule_at_starbucksvfck9.pdfIn PDF document text
    • http://soldonlakewood.com/piazzolla_libertango_piano_duetau1pi.pdfIn PDF document text
    • http://pmaider.com/bootstrap_4_responsive_registration_form_templatebjyao.pdfIn PDF document text
    • http://begemotiks.space/abbey_road_super_deluxe_book94ozn.pdfIn PDF document text
    • http://milanbeach.fun/62073972103v31oo.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/bigjHhj/rekisabisimekisilis.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/haUia2Q/biwifaxibonezi.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/hegTugg/chess_online_2_player_link.pdfIn PDF document text
    • http://max-lifting.store/803451988777069h.pdfIn PDF document text
    • http://uorott.com/white_lion_physical_adaptationsx6ghy.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/dsCOifr/kefitixorovisosejubiw.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/Dgi8gi7/kanufesubifowuxolulud.pdfIn PDF document text
    • http://mon-cmb.best/ruwolepesapelajotipadicp8b1.pdfIn PDF document text
    • http://nextauto02.ru/2017_ap_statistics_free_response_answers7rs1w.pdfIn PDF document text
    • http://namsinc.info/883525545283s5rh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cf2c7132-b042-4a19-83de-f7799d479a71/is_cyberpunk_2077_playable_on_xbox_series_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa605d69-5e66-49e2-be18-260af8231384/poemas_en_lenguas_indigenas_cortos_y_su_traduccion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1f6a91-a7aa-467d-9962-be6803f9fb4d/william_blake_poem_the_sick_rose_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38456557-4360-4250-8c3d-a4bf02373fa2/how_to_choose_living_room_color_scheme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f342582f-d340-4a02-bbb1-41186d2de95b/kegiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dae71c5-9d60-438b-9c9a-5ab3d9e63de3/tegomoxajukozizeroxedojuw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A03 5252 bytes
SHA-256: ae925e03b1a036c0ed2b37cff05fdb667c0101334ec0745498b5a0cfd67512db
font_01_sfnt_off00027bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BEC 13756 bytes
SHA-256: 79f9021425f9b3b29dda8dc6d38910c01bf37180bafa6344410df77c9d707760
font_02_sfnt_off0002a7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7AD 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off0002bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC45 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378