Malicious PDF — malware analysis report

Static analysis result for SHA-256 352280620c4c8571…

MALICIOUS

PDF

87.2 KB Created: 2021-04-26 21:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 793403aa220da12b112610719a82a09e SHA-1: 90e2ac277979f42fa4107ad1e2d9a686e677df84 SHA-256: 352280620c4c8571e1b902c89500665fb1e8b83ccd2c5da66685135d40447415
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites or download further malware. The embedded URLs point to various domains, some of which appear to be disposable hosting services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=getting+started+in+electronics+forrest+pdf PDF link annotation
    • https://cdn.sqhk.co/xumirikebixo/2gdhiih/cat_pop_island_bubble_shooter_adventures.pdfIn PDF document text
    • https://jaluzirilunotu.weebly.com/uploads/1/3/2/6/132681851/7eb00.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/g0hggdl/beyblade_burst_epic_rivals_battle_set_unboxing.pdfIn PDF document text
    • https://xelosigok.weebly.com/uploads/1/3/4/6/134630446/tefeniw.pdfIn PDF document text
    • http://maewallace.com/72710809093bkkrh.pdfIn PDF document text
    • http://nesobaka9.xyz/wegenerabusav2hy5t.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/Dw9gcck/worksafe_nz_incident_report_form.pdfIn PDF document text
    • https://cdn.sqhk.co/medipevagopu/hdhg5ge/realme_store_near_me_phone_number.pdfIn PDF document text
    • http://chelamela.org/arihant_bank_po_reasoning_chapterwise_solved_papers_download1g2xr.pdfIn PDF document text
    • http://sodalabs.club/les_miserables_25th_anniversary_cast_2019ydzkf.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/ghjcGhd/online_homeschool_planner_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/ha668tS/microsoft_flight_simulator_x_military_aircraft.pdfIn PDF document text
    • http://temilops.xyz/batman_arkham_knight_gcpd_riddler_informantmnz0g.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/W6F1LWc/veporefiro.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/TDlNOij/vebuvodosaze.pdfIn PDF document text
    • http://rubisteq.online/zirixaxorobaxotizabefhd1l.pdfIn PDF document text
    • http://doorstepcomputers.com/perdona_si_te_llamo_amor_netflix_colombia6bokg.pdfIn PDF document text
    • http://eroganoficial.site/a_christmas_carol_short_scriptj24fg.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/ezxgdja/xedujijazekizo.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/aieWijc/38691685440.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/ggeaigs/33350130692.pdfIn PDF document text
    • http://unonatur.space/32973581323cp73n.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/bjcbVif/geometry_dash_meltdown_hack_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/zhcYjhB/72479164061.pdfIn PDF document text
    • https://kulexixujida.weebly.com/uploads/1/3/4/7/134723957/bubuworoniwinamixoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 5352 bytes
SHA-256: 310a0ff836bf67f888c05d6d663ac72ba65bdae92124a06a4709b7f3d400fba5
font_01_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 10752 bytes
SHA-256: 1081bcebbd8413f080206c73663af63a046405737f1a58e5efbf6abecafa46b8