Malicious PDF — malware analysis report

Static analysis result for SHA-256 9682c12b7746f258…

MALICIOUS

PDF

76.8 KB Created: 2021-04-24 05:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5af28a1abacf55be86da378f5b326d67 SHA-1: 24abced56d117e346b003355de8519656180e007 SHA-256: 9682c12b7746f25843e6ccb5c40b8ac9d8a723b9117fea2704159977968a4518
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://baarspo.ru/strik?utm_term=how+does+sump+pump+float+switch+work PDF link annotation
    • https://cdn.sqhk.co/kerutadit/5BKic7v/merisabadebalur.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/76936685423.pdfIn PDF document text
    • http://lunamawel.22web.org/baby_driver_full_script.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jDwigig/60700662847.pdfIn PDF document text
    • http://mawejufikesiruw.22web.org/bin_sachivalay_paper_2020.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/headway_beginner_final_exam.pdfIn PDF document text
    • https://cdn.sqhk.co/luvafuza/UT6oieS/androids_saga_z.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/aifQHat/brawl_stars_box_simulator_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/ibQNifB/midugixofugutagugaxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/jeshcmK/merge_quest_alchemy.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/faicsFd/wedojosapusu.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ijYhenC/best_status_2020_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/fgciihf/hero_wars_super_stickman_defense_hack_mod_apk.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
    • http://detuzepa.rf.gd/digital_marketing_salary_toronto.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_ca16077c45f3436ca10cf1527aaadf4b.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_8d490315e299445e9b572b7c331087e3.pdf?index=trueIn PDF document text
    • http://tosefiwaniw.rf.gd/manajemen_sumber_daya_manusia_pendidikan.pdfIn PDF document text
    • http://jilevatawew.epizy.com/but_for_now_jamie_cullum_sheet_music.pdfIn PDF document text
    • http://tetexabe.epizy.com/boxijebamovizudifukexad.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/biblia_catolica_latinoamericana_descargar_gratis.pdfIn PDF document text
    • http://molugafew.epizy.com/lakegomaxojulonomidab.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/technology_assessment_process.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 5288 bytes
SHA-256: 717f5fa03825c26db9e865b25e1589bc3d694aa8fd25f07525fe8fb5ee150009
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 11224 bytes
SHA-256: fe6b5694f3682fba8c55d700a9e0b09925680812544b060fb27de154d5ae1e7c
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f