Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad91d9176a7b5f3…

MALICIOUS

PDF

68.2 KB Created: 2021-02-17 10:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 41653003a870d195a6e7f1cf07a6cd32 SHA-1: 31e46655e18a56deef87adcfe768b3d1208830fb SHA-256: 4ad91d9176a7b5f39b83a0ff48bfad59971fdc7357c8ff1f1d859f87da3aaa4b
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/aws?utm_term=how+to+clean+filter+on+edenpure+heater In PDF document text
    • https://cdn.sqhk.co/rumobotituda/sjaAJgj/black_total_launcher_theme_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5ff769e9c7aad.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/8gifMCa/pidukebifazil.pdfIn PDF document text
    • http://show-visitor.xyz/25991149975ql7rv.pdfIn PDF document text
    • http://tinutig.22web.org/ionic_bonding_worksheet_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366043/normal_5fd04f7e50f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_6023f45c97d39.pdfIn PDF document text
    • http://lodorobirat.22web.org/37612191019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fda0377d97ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_60008890d5bb9.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/sefepugolupalax/vonewozotede.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/best_good_night_wishes_quotes.pdfIn PDF document text
    • http://butazajoru.rf.gd/juser.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/baarish_yaariyan_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/72836856023.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_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 5116 bytes
SHA-256: 5174c733046f11c711b39aa6f5c1620570160aabaa002f69cdb71f5db140634b
font_01_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 10064 bytes
SHA-256: 69ed6128d8a744e66bcd3f7551489b4914cf8a0dc83b3e875c91414e084cefaf