Malicious PDF — malware analysis report

Static analysis result for SHA-256 654dbba90e654d2d…

MALICIOUS

PDF

78.5 KB Created: 2021-05-28 08:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bd3be778459685566755179fc8f9a62f SHA-1: e5f920c55b643dd882179e313e6311b084f89214 SHA-256: 654dbba90e654d2d780874c136fca364c5d1aa8dff43e603143ee9f3956dd116
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=goethe+gedichte+deutsch+englisch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366625/normal_5fe12558558aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_602b106d28ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_601418eb5f4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_603b7ddfbbbcc.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/direzixomasasupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_604eee2fd2779.pdfIn PDF document text
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/rexaletop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fec44817bb0a.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/betipapelolalitilopo.pdfIn PDF document text
    • https://tixamipoku.weebly.com/uploads/1/3/4/7/134740597/dazexijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_602c59ac75e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_603b20a63be85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_602258e947064.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/a7440612529c8.pdfIn PDF document text
    • https://fisofomopix.weebly.com/uploads/1/3/4/6/134603918/7811306.pdfIn PDF document text
    • https://tamalokumolegi.weebly.com/uploads/1/3/4/6/134656593/b5c09815a044a69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/324cb202-0ae1-4989-a662-f40c42774c40/will_there_be_a_third_book_in_the_kingkiller_chronicles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eaf231-9a2a-49bc-89c6-ea2eceb010c9/68261607975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652cf232-643c-4d49-b28c-ca7a5ac22f18/bach_cello_suite_no._1_-_prelude_double_bass_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899653ef-c6c4-4eac-900e-524c7d008bfb/easily_confused_words_worksheets_8th_grade.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 4928 bytes
SHA-256: 3cdb3c3d0f8ef6ace70391ca81d9a82e94a19ef3aaae3c59e35b77b4eb2281e1
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 11752 bytes
SHA-256: b266b2014ea6921e056d0dec2010918ad7e79e2ee42c680b06f560a369686e68

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