Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fe2b749fbc6be9…

MALICIOUS

PDF

71.6 KB Created: 2021-03-01 11:59:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 67aae11b2a5f555ac6f037b11fecc739 SHA-1: a6ce30c10d8c687fbd99e8197fb080ca847dbc92 SHA-256: 41fe2b749fbc6be9ba2d6c8ea89bbbd583f792170a78d34e61721437a1a3edf9
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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=reference+angle+worksheet+degrees In PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/9889303.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/3172625.pdfIn PDF document text
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/luxavetene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_6008c928e4556.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/89234815196.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/luwutufadugupe-bunere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5ff2e4b3ec182.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/gimexizipi.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/tudemabosafifenok.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/likadojivivofu/psychology_101_clep_study_guide.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/rizijidepilokezigimeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/cccam_panel_free.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/the_seven_laws_of_success_summary.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/cuanto_cemento_tiene_un_metro_cubico_de_hormigon.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/434585423.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 5444 bytes
SHA-256: 0763af71ed39e03cff64e0b2b06454da7855c1c2a22a14db1217201435787d58
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10128 bytes
SHA-256: 318dca2b0e350e36927634c0a057da6f12f5abdf123512005d40f69a8b6f5672

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