Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a75ed8e0e24920…

MALICIOUS

PDF

72.9 KB Created: 2021-06-03 11:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8404c0e37d33a83ac866b51794be9d57 SHA-1: 06e348b451978d619abfad0cd34922b181ee3481 SHA-256: f9a75ed8e0e24920f948355ad402b4bd96fa4dd51e7958f895554f86bb1de505
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, containing numerous external URIs. The ML classifier strongly indicated maliciousness, and heuristics confirm the presence of a mass external PDF link farm, with many links pointing to disposable hosting. While no scripts were extracted, the document's structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/pbw?utm_term=ielts+mentor+reading+academic+pdf+download PDF link annotation
    • https://xiliwawegumokap.weebly.com/uploads/1/3/4/0/134096460/rinenipekewebonefex.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/8978543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fcc0d269bbff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff920ef36003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_60b80af66cd50.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/ginowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff1d3f05807f.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/gekuvawij-rasavikinepa-lujisunowore-zezotapafifol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_60462be569fe3.pdfIn PDF document text
    • https://musibagufes.weebly.com/uploads/1/3/4/5/134587398/eeb300d30496f92.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/xujubudobapa.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/26a24b9c-9104-452a-9e91-bf08c00dd966/misty_mountains_cold_piano_sheet_music.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/sonic_mania_hack_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21e4d2e-a2fd-434f-81d2-ecc72fd159a7/how_much_do_avon_reps_make_uk.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/76227331229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382ce8d6-740d-4d96-ae9e-94d232ee205c/2644183797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93875dc6-9405-4abe-9ff2-8f1b34f7eba7/tezimix.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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 5504 bytes
SHA-256: 62455203da97596d9b086390a7a4721d348b70b713093e0068279a9ed141209d
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10916 bytes
SHA-256: 384c20225c20ec68588c861bddd4f056c20ee1d693f1e0f84c9c3c227efe6fe1

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