Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ebb9200e8213e6…

MALICIOUS

PDF

85.8 KB Created: 2021-03-26 08:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 236563dd0188a0ee290d0b30b8abc37d SHA-1: 9a458bf6cef985df3d3ea7de5b42a1112d33312c SHA-256: a8ebb9200e8213e66c990f1496ac5538f745ddc7c5cd6563080cc01d24fe6511
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, with a critical heuristic firing for a large external link farm. The document body, though heavily obfuscated, contains a title suggesting a lure related to controlling a ceiling fan. The presence of numerous external URLs, including those on disposable hosting, indicates an attempt to redirect users to potentially malicious sites, likely for phishing or scam purposes. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+control+ceiling+fan+without+remote PDF link annotation
    • https://cdn.sqhk.co/zozusexub/Lhiyzhi/car_crash_cross_county_parkway.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/tukebila.pdfIn PDF document text
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/lunif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497353/normal_5fdc9edd09e44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5ff85bf1e7a05.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/jbcAMhc/counting_1_to_10_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/ggfsKjf/48220251653.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorabuzep/e8WneGq/jevunat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_60011eaf8b467.pdfIn PDF document text
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/6b1e5cbca0f71.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/fe0a1d77.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/noxovigev.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/f0c44795-979f-4532-acd8-5c60eac5045e/11313002435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11503a9c-49b2-422e-b5b7-a9ee489c5e94/45396511642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575c0920-ed95-48f5-997d-ecf16c0def60/the_half_has_never_been_told_criticism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60969c97-073d-4550-9cd1-70afeb2959f6/what_gre_score_do_i_need_for_vet_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c0fed0-d8be-41b9-ba13-a1dec4c44aa0/gusifapemivomulab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a1456b-2e3e-485d-9f14-f9f302057f37/xerojagezuwabunamosuvikuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24466074-edbc-463b-b754-ccfdd0212bcb/how_to_make_simple_lego_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55437f1-337d-4d26-8581-2c32252bfd9d/the_titans_curse_graphic_novel_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e28c175-f45a-46ef-a16e-e9904744b7a0/36418101808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d49f48-094c-4d4b-92c7-4f3a27d44c33/nikon_p-223_3x32_rifle_scope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c75779c-e084-4730-9d25-07d7701ac1a3/texasokoziwowaxavaxunitu.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_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 5168 bytes
SHA-256: 797c363f83a6d975f09ded1443fe4c9064876a452146ea5aa81b64531aa715f2
font_01_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 11136 bytes
SHA-256: a332155154f6c2088f111d718efdad103a2fea3628a4e8a43541c80eb1501f21

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