Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9717947d9fa2935…

MALICIOUS

PDF

101.9 KB Created: 2021-06-03 00:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dc5968ee89fbb38a220012cd32c6cd2b SHA-1: 1a2fd804f5557735682bfd0656476289973d4689 SHA-256: e9717947d9fa29357eb633654d5c0fc3887b356b00795e680e97ffdceaff8116
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. The primary URL, https://inwebjor.ru/pbw?utm_term=operations+management+6th+edition+pdf, suggests a lure related to a specific book edition, likely to trick users into downloading a malicious payload or visiting a phishing site. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://inwebjor.ru/pbw?utm_term=operations+management+6th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fc90eaf797f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5fe1c31c31cb4.pdfIn PDF document text
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/fudiwono-xulavoturegojas-zerimubobovuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_600e988f0fa72.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/9756982.pdfIn PDF document text
    • https://devonejejarib.weebly.com/uploads/1/3/4/6/134608322/gikajejadopug_leboto_dokuzutita.pdfIn PDF document text
    • https://nusaniwufozeg.weebly.com/uploads/1/3/4/7/134751508/pinuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144421854/xaxabeluwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8ce5f5-537a-4b2f-bb8e-00e6e87307d4/pekogakopasun.pdfIn PDF document text
    • http://redejok.pbworks.com/f/fowiwabimafakiwakofoje.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144528810/40585692494.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/21087715668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc87febe-5c6c-47ef-9c38-796ee27797f6/dd_5e_boat_travel_speed.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144454401/how_to_read_multimeter_ohms.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144441525/qcm_sur_la_rvolution_franaise_4me.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/pumidogomogapukef.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_much_does_it_cost_to_open_a_kung_fu_tea_franchise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4237301-276c-49e2-963e-96fa551b608f/konivokidadegitemale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80f55e1-3fd9-4f3b-9dd2-7363bef35c4d/69283394328.pdfIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144423969/xakexoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ef4a8c-d414-4861-a1b4-7f78cefc43b7/zozek.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413331/40754728724.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_off00014d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1D 5604 bytes
SHA-256: 2f8c1927ac0d2b1b9173f0c7fd1c7ff0d94992e5e69a1313e0cbec33ddfe2004
font_01_sfnt_off00015ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFB 12132 bytes
SHA-256: c36f8fa082a3f205b7debf76fb4b7c6cf31c433abafd233ecb4a25137a1fb662