Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d4c102ddb724a…

MALICIOUS

PDF

65.4 KB Created: 2021-02-12 13:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 92b51aaf1236289ad55d1b73b730ebc0 SHA-1: c162fa57d26a7e942d2b9379e0b8267b9e13c3ff SHA-256: af5d4c102ddb724a5c44767596f570873d2497649734a838b02af24f869b00ad
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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=words+start+with+na In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5ff8ae0413796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd66ffcb70a4.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/RhhieFk/kilamepebitigimimiviji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421969/normal_6005746abcf40.pdfIn PDF document text
    • http://boputev.66ghz.com/8412019441.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/apple_boot_camp_4.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/ua2VUjf/small_animal_radiology_and_ultrasonography_burk.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://gepopimasirepav.rf.gd/54222375214.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/best_wallpapers_for.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/pevenos.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/basic_histology_and_cytology.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/seepex_progressive_cavity_pump_manual.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_off0000b84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84F 4656 bytes
SHA-256: ff93e5c82f16f8761410850374cf527500ef3ac0be717cc7b2937185e653586c
font_01_sfnt_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 10308 bytes
SHA-256: 11fa9d513a01b00e5edb973b28e3a72458b75a1900fadfccb3996dec098c48f1
font_02_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3