Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63a92f81ddfde69…

MALICIOUS

PDF

78.5 KB Created: 2021-05-07 19:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 03fec3111505abc808f69a67076a5227 SHA-1: e23a27b659787c3158a948f883607fef90c2fcef SHA-256: a63a92f81ddfde69ab108bac9fa9a9b7a366b85c714d21f2906bbc1a5d284cd7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is dafemum.ru, which is disguised with a search term related to 'Wordly wise 3000 book 3 answer key pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dafemum.ru/strik?utm_term=wordly+wise+3000+book+3+answer+key+pdf PDF link annotation
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/ac5e7bf80c01.pdfIn PDF document text
    • https://kogejuxo.weebly.com/uploads/1/3/1/6/131606118/lifotis.pdfIn PDF document text
    • https://cdn.sqhk.co/nobegasosev/Eetifjh/weguximomimakojunowaxu.pdfIn PDF document text
    • http://matrixbicycles.com/how_to_write_an_essay_about_a_book_example7c0mn.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/81893191906f4maq.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/hhhcjED/kezetebixeduzodelifemoki.pdfIn PDF document text
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/3561202.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/suzixegazunow/iadt_guidelines_avulsion.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_445552040c124857af22839424668230.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d500a1-3918-49b3-a61e-172ab98ff3d1/87548361636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f195860-803c-45c6-b7f8-11d4b288e061/cradlepoint_mbr1200_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/butterfly_full_hd_images.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/carrying_you_guitar_tab.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7d60d586912a4363b62a4230ef0a1cb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e41758-a1ad-462c-b0a8-6568e9d23e3a/how_to_improve_time_management_during_exams.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_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 5752 bytes
SHA-256: 14befc9701b95c05c1b452f18cf1d9fa7fc8ced92d690f290b78716601936b99
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 10788 bytes
SHA-256: f8babdface20f4fa6b776118c29bfaa31d97d453ad7366dc7edb1b216deb4cd7

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