Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1b4b3d4eb23275…

MALICIOUS

PDF

72.6 KB Created: 2021-02-23 08:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 15231d0eb3f2b0d5e652e37207dc1b8b SHA-1: fe1547c0d5fbc4e2976c048c77709dd50b68faf0 SHA-256: 4a1b4b3d4eb232752257a43588f3e9cad101f25f778e4794e8040f44e1159bac
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://yafferge.ru/wix?keyword=human+resource+management+12th+edition+pdf In PDF document text
    • https://jefibapo.weebly.com/uploads/1/3/2/7/132712451/nupozawesexux.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/7Eq9Zzo/military_mod_for_minecraft_pe_mcpe.pdfIn PDF document text
    • http://ig-supportcenter.xyz/kalimba_manualg1582.pdfIn PDF document text
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/6403152.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/aa1ee93fdcf0d5.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/9743801.pdfIn PDF document text
    • http://helpcontactform.com/dupalup96l9.pdfIn PDF document text
    • http://jomotew.iblogger.org/dragon_ball_z_games_for_android_ppsspp.pdfIn PDF document text
    • http://raffle.website/which_country_is_highest_per_capita_income4qv1a.pdfIn PDF document text
    • http://organic100.fun/560249461105jv7w.pdfIn PDF document text
    • http://stat-index-co.com/wixurugijutijp3m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/94116595949.pdfIn PDF document text
    • http://sofizeximixa.epizy.com/91297623262.pdfIn PDF document text
    • http://gikisomu.epizy.com/conics_hyperbola_worksheet.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/46578179971.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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 5684 bytes
SHA-256: 921cfc5edb23e5927b0f8a121bf77fdb438aceb7ad602bdf16717a75c004fc61
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10292 bytes
SHA-256: 4aa0fbe42916c8ae605a6ef006a0e016c5f0d9e4c4e5204f90a42ff44e602a83