Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9fa1ff046b98cb…

MALICIOUS

PDF

80.6 KB Created: 2021-05-07 04:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bf203352e125ea46f478df5db1e4337b SHA-1: eebee47c3e8b99c6543af4ed256774bc40c38244 SHA-256: 7a9fa1ff046b98cbce3de9ccd201ef76f698445b182eae12037b72f350d459b7
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download' lure further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious workflow, potentially involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=dayton+band+saw+3z360d PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403260/normal_5ff166f8874e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_6068993ed74b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_601b7d2d6d626.pdfIn PDF document text
    • http://pixelbarista.com/home_paint_colors_applvpwg.pdfIn PDF document text
    • http://genusadnlo.space/standard_en55024_downloadi8s8a.pdfIn PDF document text
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/5140408.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/majoponasarew_livukuf.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/fejeje_kasif.pdfIn PDF document text
    • http://iminn.ru/poemas_de_lengua_indigena_traducida_en_espaolq0e6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/does_stock_market_close_early_on_good_friday.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/faux_designer_books_decor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2168586b-e0c8-4362-9656-f1bce5bc9dfd/roald_dahl_short_stories_horror.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/lexique_electrotechnique_anglais_francais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7dc9a1-8cb5-40d4-aa42-1e880b85f7f3/77298854853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542f41b7-ca49-4e29-81aa-3958bffa62f1/47227754272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99897a6b-9d1f-4ffd-966f-e73ecceb3a3b/lewekifemesugufibofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b64b93-51ba-4f03-b3a8-7c9bb3d20d9a/lizelovatedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4aec2f2-cbc2-4703-b2f5-48fad34f1d13/digi_2_tv_online_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81764a93-5afb-41e5-b09b-2dab5624fc23/hp_pavilion_27-inch_quantum_dot_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cdecdd-d65e-41cc-9097-b51d29b47f42/simowuvakurigiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f6d9d8-1d1b-4f54-99cc-400f13170ba6/wuvutilov.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_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 5536 bytes
SHA-256: 4a8693aa830ec8e615c42200a7995a68534d333bbb85d2aa217ed3d8db024734
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 11460 bytes
SHA-256: 7255b49ff4b6a105574d335c7a387d234f733f4a1eda18be2ea0449613e11f00

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