Malicious PDF — malware analysis report

Static analysis result for SHA-256 350516d638c1c259…

MALICIOUS

PDF

67.8 KB Created: 2021-03-05 10:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d22317bf9d9d7c92c08456fc81061a3c SHA-1: a2f74c42ebfa00e03c967150707888871ac80e1e SHA-256: 350516d638c1c2594fa1de265ea663509cfe6b0599a24ded0a5d5e206217b03b
126 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, many hosted on disposable domains like weebly.com, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests a potential for distributing further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://golowaki.ru/123?utm_term=pizzeria+delight+cambridge PDF link annotation
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/a709c0.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/wagefus.pdfIn PDF document text
    • https://bosesupipi.weebly.com/uploads/1/3/4/8/134899809/zimudukavaza_wevasitis_xejesurudaxexim_bikuwime.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/meruwijos.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/e5168175.pdfIn PDF document text
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/gabup.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/1743578.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/32013845331.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/jomamogonepebetug.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/6770d8a3-0711-4919-92ba-49939c152d17/6543935278.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_d418178a1dd144d98afac7d94d743a77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e399ed-7804-46b2-955f-395fa4029c82/descargar_msica_de_zacarias_ferreira_recuerdos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafc695f-0f94-4206-b4a0-9c0c127cb0d2/6569223287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7916a65c-d887-4fb3-a350-bf329cd32beb/93464855098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e93f47-8fee-4ff6-88f7-04975b2ed320/80732408513.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/midapizusub.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_67a71728b1444f10b36f55df2702c290.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/how_to_start_a_comic_script.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/grade_1_science_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/sivoku.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/sis_azalia_audio_controller_driver.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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 5368 bytes
SHA-256: 437fba7866328f37286a11505af53699a9b839db65dec4c9aeb23ce94b33f219
font_01_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 10828 bytes
SHA-256: b76c9ffce2667d0b2f51dc5bff03a86172280a60f522d0b4fa483906738fdde7