Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf964e7b17fb53f…

MALICIOUS

PDF

72.0 KB Created: 2021-04-15 09:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 30a9fda22580b88c4f0db696e4fd2d6b SHA-1: d8c5eb8a8dc8fa804a4658674a5bebf89eddf67c SHA-256: 5cf964e7b17fb53f154b8ea4984993e89e0a264b9a20f946a6d3e84d2b689089
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to potentially malicious URLs.

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://maypoin.ru/strik?utm_term=what+lights+should+be+flashing+on+my+modem PDF link annotation
    • http://bijeruma.iblogger.org/pdf_orthographe_illustre.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/5d708a3.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/08c761ec48f.pdfIn PDF document text
    • https://sezosuxinowa.weebly.com/uploads/1/3/4/2/134266263/9303395.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/bupevekikamawi.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/buvowojarexa.pdfIn PDF document text
    • https://siroxejuvumuku.weebly.com/uploads/1/3/4/6/134657252/974b5a8768b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://silisawis.rf.gd/symptoms_of_pcos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a55075-8925-49d9-a5b9-7e6dc0fde18a/25190951027.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/le_petit_prince_english_and_french_side_by_side.pdfIn PDF document text
    • http://wogurep.epizy.com/29323013592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7ff946-7741-479e-a5a5-392ac7193bcd/bow_tie_cinemas_royale_6_norwalk_ct.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/78657661608.pdfIn PDF document text
    • http://wipupafe.rf.gd/myron_mixon_recipes.pdfIn PDF document text
    • http://pidawuz.epizy.com/charts_of_accounts_excel_template.pdfIn PDF document text
    • http://zegorurowi.epizy.com/sat_writing_and_language_practice_test.pdfIn PDF document text
    • http://sejofinudagiji.epizy.com/pesuwufujunefebabonel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9fd254-de2e-4175-a135-ee102dc3604b/50904125898.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 5480 bytes
SHA-256: 4da27c0a6bebb65c69477c89cdd79092136714abbe551336ad53e13a080d65fd
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10436 bytes
SHA-256: dc0b35325df17eb0ef783943ed22a8b9e962936f18257bc65ab6295c5517beb6

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