Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47052934bbb7434…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 15:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6505751db32f7306a8b6fc5d2fb242e6 SHA-1: 2bf0e556545eb49a8831efe9b517a1a35c9c2226 SHA-256: d47052934bbb74349a445241151fbdd162c021624fcd992e29d6ecd2648e1ca8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lozipotod.ru/wix?keyword=homedics+ultrasonic+humidifier+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471253/normal_60322f6fcf42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_6060819c02c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_602022c0ab41f.pdfIn PDF document text
    • http://kewiwidifimanop.22web.org/bartholomew_school_new_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6021d7d8cf6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_604400c59e579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rujabepifar/kalesizevibokejoxinituz.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_447709d4bd8b4913b49a07c80e9e495e.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_466067a0a1ab4566989080d3a0a46980.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_fc3397f92bbd48cdb6ad48274901e17b.pdf?index=trueIn PDF document text
    • http://dikedelunok.rf.gd/ac_joint_injury_recovery_exercises.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_ec8f69fb7b78492c92e9550b01d2c6a4.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_f7a5a87a01b0487195a7b7ce3b89f1cb.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_f744644e8ba94ec5a0c48d3a3193cb6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/kunaki.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_a7da586cb2a14667b09f138fa8f43b26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/20005443449.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_2d9d72cc6ca944ef95d22c9edb123191.pdf?index=trueIn PDF document text
    • http://sedijinuv.epizy.com/filujawajowin.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_6711ffc146e742789a5700305ad2a789.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_81c397d7a09b4268aa3ba04bd6eeff62.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_345fddc68ba3443fb9a03f7c81f2b01f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/22391896745.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_00aed3cfb11c4f978ca23d8cc3d2933e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/sataf.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_bc003ab364014229bca72da115d7d130.pdf?index=trueIn PDF document text
    • http://lutidufewujasa.epizy.com/71342467189.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 5104 bytes
SHA-256: 5e80bfed574df014f1e328846b95fa109397ad377af5cd8244be4c1204645ae8
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 11268 bytes
SHA-256: 417c8928c46a5f97816e3483db407b507dec0ec9f4bfe02316eaa28ae764b457
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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