Malicious PDF — malware analysis report

Static analysis result for SHA-256 1705d647c2a719ff…

MALICIOUS

PDF

70.5 KB Created: 2021-03-08 19:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 025805907b382cacb2e7da0e37bcccb2 SHA-1: 2e11af1ab27babd1bb4c0144702732f709441887 SHA-256: 1705d647c2a719ff157639d20ffb4aa44e8cb60a7b41a8f2ed17f18220c4621e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious sites. The presence of embedded URLs and the structure of the PDF point towards an attempt to manipulate search engine results or distribute malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wb?keyword=rii%20keyboard%20settings PDF link annotation
    • https://veranaza.weebly.com/uploads/1/3/4/6/134665567/265452.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/0ce377cc9d4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_603b369868797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_601a3982648d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_601f6151a130b.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/df621a4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_601299e994bbf.pdfIn PDF document text
    • https://najememate.weebly.com/uploads/1/3/4/8/134867979/mopeneta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fde58c1a0741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_600603915af40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_6029408a4649c.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/wiloxowiwizema.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/4820517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6019f23529236.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/zatalirudamoz-jowewuzik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_905266a6ff97434a9ef3efd665606eba.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_3650a85d41674935a5778c7a06960dd2.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_c054b2dabf97459cb82039dedfc36ebd.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_61fcb900e22b46cba66b5c3696d782ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abcaef1-6ec4-4a79-8c97-9d8710721efb/vocabulary_workshop_level_d_unit_2_answers_choosing_the_right_word.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_e08a1011b9bb40b49cf1b6fd835c4701.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce4fffb5-2b11-4db7-90dd-4fbb28f9fc5b/what_is_remington_700_adl_bdl_cdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6025144-aee5-4cb3-9f84-b70db84a1cdf/evenflo_embrace_35_pro.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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 5276 bytes
SHA-256: c15ba44c62e9851125129de9c9e1bea3511a2637514fe9dfe79ee6122f145465
font_01_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 10808 bytes
SHA-256: 95fcd9338488c79d0c13c21b215a2f95c0221a2cf688b19b3f5675c8b589eefd