Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f3fa72644de103…

MALICIOUS

PDF

64.4 KB Created: 2021-02-14 10:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d0bc99ca9d8f1a16f712333826c5078 SHA-1: 306aa1cc3c327b6a499dd3e4df41bec23e2c0659 SHA-256: d3f3fa72644de103eb67eb60a028e525463421365cc5a4f5dc7636c1b31eec04
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, reinforcing the malicious intent of redirecting users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=my+guitar+shop+sql+answers+chapter+4 PDF link annotation
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/vomobofok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_60157ee56e030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ff4e2aa6b2fa.pdfIn PDF document text
    • http://shlifovka-pol.website/defazojolobulena9xy1s.pdfIn PDF document text
    • http://trycabinets.xyz/zumejinaselenovabowawokiip1.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/fevowuzufela-ragezugukeki.pdfIn PDF document text
    • http://findattime.com/building_construction_principles_materials_and_systems_3rd_edition_freei87k4.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/nuliposiwirod_dajanepomosem_mofizamuseb_xegiwanugu.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/3040584.pdfIn PDF document text
    • http://scm03.ru/accountancy_class_12_question_paper_20172ncua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_600b733d8ea12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fde05ab2529d.pdfIn PDF document text
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/tinekutufa.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/3005812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_5fdbf915e00fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425929/normal_5ff7b15e2b970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60243e1338458.pdfIn PDF document text
    • https://jefabulovonaju.weebly.com/uploads/1/3/1/4/131438419/b6c5da.pdfIn PDF document text
    • https://bupowuxa.weebly.com/uploads/1/3/5/3/135317106/wugovojig-pidifejudefijuj-gekunadamep.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/6805da8f5493f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5fd06f969959a.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/nogarosigib-gixobiwip-vejagifitumefo-xupag.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/afb7ba8.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/1317198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000be15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE15 5608 bytes
SHA-256: cbe80ca226925e8e396622f55ea379a96c96894c2dfad6aa72cc309775e709a6
font_01_sfnt_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 10192 bytes
SHA-256: f72016a8a81def93f1a565a5aa6c84eb2205ad5e1af561f796834fb0dbf31ebc