Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d33b5d9b9f74d7…

MALICIOUS

PDF

77.3 KB Created: 2021-03-12 20:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1fc67c17cd8fc59d698e4f0485b4f904 SHA-1: 2d90f67a367f674c22841312956d9ae5cd133665 SHA-256: 63d33b5d9b9f74d7cbaf6de2a5e13d546fe4dddde825fcec1d764094c348c446
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. This structure is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://botokaw.ru/aws?utm_term=tecumseh+10+hp+engine+carburetor PDF link annotation
    • http://helpcontactform.com/34804824348vis0u.pdfIn PDF document text
    • http://paktum.pro/appvalley_android_not_workingsbx8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_601988b0a5075.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/zogesepepo_sevosuzibazivix_liwoxebepiko.pdfIn PDF document text
    • https://xowafoxupa.weebly.com/uploads/1/3/3/9/133986725/gupowivitenafefebu.pdfIn PDF document text
    • https://pusetuliv.weebly.com/uploads/1/3/1/6/131607438/7f92f.pdfIn PDF document text
    • http://trokot-new.online/12107183503rsr6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_6035ac7eba055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_5fd8d4d711428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_603caee632929.pdfIn PDF document text
    • http://babysampler.com/loxixerazuwanafolsc5oi.pdfIn PDF document text
    • http://test123test.xyz/how_do_i_clean_my_ge_dishwasher_filter70s6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424330/normal_5fed9d38d20f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_5fc7ea3223abe.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/nexizar-vetesabewos-vukudobubuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_600e7309d55cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5ff84c6a0f993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_600ddafaae91c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_603266b0bcc4a.pdfIn PDF document text
    • https://wewuketis.weebly.com/uploads/1/3/5/3/135327502/7626712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_602b6421eb5dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_6020a1d54c4af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefekug.rf.gd/lagu_chop_suey_system.pdfIn PDF document text
    • http://xakafof.rf.gd/66022697739.pdfIn PDF document text
    • http://lamujep.rf.gd/13561293511.pdfIn PDF document text
    • http://feladomiforokek.rf.gd/conductance_definition.pdfIn PDF document text
    • http://janabamimis.rf.gd/customer_feedback_analysis_template.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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 5596 bytes
SHA-256: 4cd046f2f00aa11a7d3ed7dd6ea642522916227da074f7fb14114870fd3ec8df
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 10588 bytes
SHA-256: 566414cfa39eb462ef9f856b8937625a3735faede6c47cc41618b2123f26ce18