Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b9de241040cb05…

MALICIOUS

PDF

67.3 KB Created: 2021-02-23 04:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: f466ff4a4a682d8c0f13c0e7508e48bc SHA-1: 5f42498e3e74ee6f6d97bffab3480be29dfa4a80 SHA-256: 23b9de241040cb0546e3343448b45f831ea0b721280b18944f92bb8f1c1ed0d4
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/wix?keyword=vocabulary+workshop+level+d+unit+2+answers+synonyms+antonyms In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_602a366a8554c.pdfIn PDF document text
    • https://jifibixivedud.weebly.com/uploads/1/3/6/0/136082986/rurisape_xebuwu.pdfIn PDF document text
    • http://ogranicbio.fun/wapelafiwolujerokizaul9ai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_600c538aa8346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fe594a740d80.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/pibizis.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/takus_timun.pdfIn PDF document text
    • http://srakan.space/buwamamoposivejobivepzd1l.pdfIn PDF document text
    • http://walletelectrum.buzz/lefemutegakijisimedapazeh9uo.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/7063678.pdfIn PDF document text
    • http://bestunew.xyz/pijurofax0zddv.pdfIn PDF document text
    • http://nibatuw.iblogger.org/cab_full_form_in_law.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fdd0bd02c248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410190/normal_5ffc9f988c39a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linopiziv.epizy.com/87339982075.pdfIn PDF document text
    • http://finuximiwogum.rf.gd/zijovof.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/shop_lease_agreement_format_in_english.pdfIn PDF document text
    • http://fedubumisuvek.epizy.com/jesepugonowojim.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/debedakepavasajul.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/bojack_horseman_season_3_episode_11_script.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_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 5868 bytes
SHA-256: cc0e1d532e1b8d8285df9773f2781d0f5445e121b3f8f3d1127a3dc0ef264e53
font_01_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 9888 bytes
SHA-256: 7cf399e1ae45fea32ae17a9891238e7cb65ec455c0d35f25eabaa1f01ad7d16b

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