Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bdf4610863401e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 05:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d19ac24725d21415ea3c815f7a9f3b45 SHA-1: f536a245fc56e0abd3dac4735694e81d1018e583 SHA-256: 72bdf4610863401e3710372b1cc1a55494e9b1b258150a306a0ed82598d5def5
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 or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/123?utm_term=audio+video+converter+for+android PDF link annotation
    • https://cdn.sqhk.co/nufuwijili/hdCid14/gojanebamumidi.pdfIn PDF document text
    • https://cdn.sqhk.co/firufolati/lhj4jif/56787025427.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/jg0gchi/farm_guns_alien_clash_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486213/normal_6008fddc2660b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_600ae3d62c9ed.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/7127181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60421a2f48520.pdfIn PDF document text
    • https://cdn.sqhk.co/gikokimofegi/VKciivh/93955992883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_5ff7819fc8d72.pdfIn PDF document text
    • http://liwuzagesasa.22web.org/7701349035.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/KwieU5n/morepadutilemokupemajon.pdfIn PDF document text
    • https://waduwira.weebly.com/uploads/1/3/0/9/130969623/98397d226641.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/jugibuviz-fapokejutapuf-bomizebar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5ff27543941ab.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/hhdZkhI/50041803357.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/egdBivE/dj_sampler_effects_tagalog.pdfIn PDF document text
    • http://lasabobobatir.22web.org/how_to_start_up_a_boiler_from_cold.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_32b2d169cae44471b24f6b1000d344c5.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_9c7c525feb4443cb93e45dd825b96cf7.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_92b69e74b5854480a9e6408ddddf529d.pdf?index=trueIn PDF document text
    • http://nitovotiroxe.epizy.com/technical_report_writing_course_syllabus.pdfIn PDF document text
    • http://wuburujezajewix.epizy.com/north_america_map_with_cities.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_57e025465a524a87bed253d7aecf25ed.pdf?index=trueIn PDF document text
    • http://xatulebebulife.rf.gd/tobiduzub.pdfIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_20a1ddf8ed544a839d4875ea307fbad2.pdf?index=trueIn 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_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 4856 bytes
SHA-256: d1fe644911c17b011573ed03280492d148379f6a95cb9f9df1c34547e6b93510
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10976 bytes
SHA-256: abf83009d1a33521a067ef7e34a245128901bdaf95b58620fc5416958b982dbe