Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd5696b5f0d2365…

MALICIOUS

PDF

79.8 KB Created: 2021-04-21 06:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f9af7646c3e3ca36ba81b7ba6cfdb0e1 SHA-1: 9874ae78c34c8bf81bd27848c7cc5e3d8d91e53f SHA-256: 6cd5696b5f0d2365d993f722a2091958afb742cab56b2028d2d5676a91db1a10
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a potential for malicious redirection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/strik?utm_term=honda+eb3500+generator+service+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/totimujid/MZJjfuY/39185195305.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/cjfggha/clash_of_clans_wiki_wall_ring.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/wfHDAjg/vebugopuforoler.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/wefowosukojudorob.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/Jiiidgc/kekojofikarorifujusujakik.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugubobo/SkUjfhj/download_methodist_shona_hymn_book.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/e4ebda6e-0bd8-4d9c-97a7-582cb9ef100c/who_plays_robin_in_man_about_the_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850baee-f00b-4e03-a789-f9594807f1d7/the_end_of_dieting_by_dr._joel_fuhrman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcf5a61-47f1-4642-9ce3-c16798dcfb12/vinotufelapepu.pdfIn PDF document text
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_ee400823046745009c70b739f15ebb3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ea6121-eee3-47c6-b402-b06b3196e2da/vukuninumuremusebiwini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fd06d5-a7c3-432a-8c5a-4cfaa523d414/dominos_pizza_recipe_menu.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_463d08fdf7a64066a82b089dea9971e0.pdf?index=trueIn PDF document text
    • http://bujijawuta.atwebpages.com/biochemistry_lehninger.pdfIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_83aca755bd4245d3b4b613590fe97f2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be28b6a9-993d-4dca-b59c-4127a5ae5d01/como_crear_un_documento_con_imagenes_escaneadas.pdfIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_38c17503f982446380320e7f5458fa86.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_ed223ee7330444679f78e45a7f72d032.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8214f079-56a2-48cf-b4e2-37c8defd6c30/92728457778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a891ea7a-e3b9-4c70-837d-6a3a49d2db30/examkrackers_mcat_101_passages_biology_1_molecules.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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 6064 bytes
SHA-256: 8c6cb8fb3ee4e4cd89852d7c3ff0986362888e9326e41bf1319e68e37a29b1b5
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10720 bytes
SHA-256: 11d52d29b09a0351c2b237d366069056cd07bc8bde792bb576614cfdbdd8ae3e