Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc3ca352801d96d…

MALICIOUS

PDF

88.3 KB Created: 2021-04-27 03:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1760f574039d6f88b35654fe130395d1 SHA-1: bd13039004c6897a0dd6e6c178fc7dc657c36709 SHA-256: 9fc3ca352801d96da3d968789a61dc98bc6b6416aa439cd1e70182aaf47abe89
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=medication+administered+via+g+tube, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=medication+administered+via+g+tube PDF link annotation
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/pebunebumiba.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/belt_and_road_initiative_2020.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/953320.pdfIn PDF document text
    • http://nepizomojafedez.22web.org/online_application_form_of_punjab_university.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/james_and_the_giant_peach_musical_original_cast.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/49545656176.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/biryani_recipe_in_tamil_language.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_c1a9e9a704a746eb92e5e2a3df1484b9.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_7a83d1fa2e534216909c73d5afc569e9.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_5dfcf1c6c6934d1b80faf83a71985cc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff36ecdb-498e-4a14-bf74-06a996dcfdee/tobigavifixepijosolemax.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_f273d529ff6d44ada77122fd8520b59e.pdf?index=trueIn PDF document text
    • http://xefesogojodegu.epizy.com/5159043449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f23e86-b4a9-4d4b-9da3-719b37e95621/74516970722.pdfIn PDF document text
    • https://adea4596-07c4-4c45-ba97-107779ed6dc5.filesusr.com/ugd/5bd9e2_9b53b8b0f18546f7a71141d0b730ae44.pdf?index=trueIn PDF document text
    • http://lexojowal.epizy.com/24417228688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef7ca6b-f506-4785-b26b-ff29c3729d18/86506802381.pdfIn PDF document text
    • http://tuxojemuje.rf.gd/dudojor.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_ed82705f452d4de5b1e5cfb48b0e069c.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_8e242db799b04c4ebd9f173ba6dd0786.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_b7561c5a258c4dabab9820d18ca4a35d.pdf?index=trueIn PDF document text
    • http://lisunamubeso.epizy.com/86264505416.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_c1613aa16f4a485b9e48bf87636e6ea0.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_b4c6bbc06f0b41adaf6ff83948bf5b6f.pdf?index=trueIn 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_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 5432 bytes
SHA-256: 5b075dff59b5d97e4f5454d2c1ce5cd51afa2198b3edf79a4ee39e8088f7f183
font_01_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 10696 bytes
SHA-256: 5a4bb22f62f36feb597beac791009921038e42aafb2ced36dcdedfb3c8665259

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