Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd89ac5d79c086d…

MALICIOUS

PDF

73.5 KB Created: 2021-04-18 08:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3b99ef99b05331ec52bf72f7c504d4ba SHA-1: a9a14fa23386cd7c3566c40ddb57a8faa64c5757 SHA-256: 4cd89ac5d79c086dc9db36973c36f2587f6b5980d75ba6ca6c9933b34e68a8ef
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL, https://jumiwimov.ru/strik?utm_term=lexmark+ms310dn+toner+reset, suggests a potential phishing or scam attempt related to printer toner. The ML classifier strongly indicates maliciousness, and the presence of numerous links on potentially disposable hosting reinforces this assessment.

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://jumiwimov.ru/strik?utm_term=lexmark+ms310dn+toner+reset PDF link annotation
    • https://cdn.sqhk.co/dedesonor/fHge1ic/cowboy_boots_amazon_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/diejcGU/monstera_plant_nz_bunnings.pdfIn PDF document text
    • https://cdn.sqhk.co/fozozumaj/jdgiNZ3/wallpaper_hd_for_mobile_free_download_zedge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_6029f472c2a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_605b7a0ca8434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_605307525f2f9.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/jfN6haZ/life_is_strange_2_episode_5_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_603c1659e5200.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/X6Gxhak/bujulinugulesogemakiwor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_f7d99150cce64494b02f2bc86e367fa4.pdf?index=trueIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_bfa676a79e97491ebd6c860729a16873.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_b7d18c5c516c4b3ea8ab8f47cd8ab512.pdf?index=trueIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_b3a7a61e93f249e1aaac305b7d489fb0.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_e52b7f260c36403eba2cd1b99b35d835.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_f1c97530a61d4b45aebd5d810c482bda.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_563a503c425c4c26b3d59417dad87e3e.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_276a8c07de2c400486a432fc77f7e419.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ritoma/27385545497.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/demefalekipipozusojipogir.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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 5372 bytes
SHA-256: 5e3df9f46360cc3cffed6af61f5571129d2929669931481e043e576d7f5a59d6
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 11236 bytes
SHA-256: 1f062f5761c1a524dbd3a29f8469cedacb497e700aff18598f766f3dad8c32e3

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