Malicious PDF — malware analysis report

Static analysis result for SHA-256 4972d5110a8688f8…

MALICIOUS

PDF

99.8 KB Created: 2021-03-16 10:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4cf36ad5e09c646fcb8a96c7b69dd737 SHA-1: c589621e232a86fd918645d93d4197cc940a1e58 SHA-256: 4972d5110a8688f85c22fe043bfecb96fc828f294c2468ee440da162ecba865a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The primary malicious URL identified is https://jacksth.ru/123?utm_term=automotive+lighting+technology+pdf, which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=automotive+lighting+technology+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/929fa191-0336-4bf1-9d63-1fe4f1c1da12/can_i_get_procreate_on_ipad.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_0bcf5a3dd98d4c668205a2a309c87c75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/784091a6-5da9-4b71-898a-7255358aa8f0/76998084001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871325bb-207a-46ab-9639-bea2af0a0f5d/what_does_a_critical_response_paper_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b93599-df57-4662-b46d-88976afd77b9/17_indisputable_laws_of_teamwork_summary.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_80bb885f02d04496b3c0b872c2755a01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d619168-320f-4850-8cb1-e4425e49cdec/vakila.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_d5a4fd522f0e498f8372524c8a85547e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/bizerba_gsp_hd_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/60024099777.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_a779152906454402b7f3cccf82d80144.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_6b23bd497ae04dc499a6bcbc022d95e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a77f200-dca8-4f6e-9ffe-136ace6c4cfb/abdul_kalam_books_in_telugu.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_59f2d9ea85a74fa18af274ef7ca3f234.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_bc76c8dda8004a959f3094a0666eb776.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_953392caf046468f89e5cc1aae3c4276.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_bcc1c1b7813343d5a5901af68987901b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/microsoft_games_for_windows_live_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/how_to_charge_ti_30x_iis.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_3654e75ca402405da62e7485485d8add.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3708939a-d7cd-4bd2-ad45-07e5bf476b0b/78165312574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d71ebe-cf85-498e-8427-e212253ef79a/irobot_roomba_530_battery_replacement.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_off00014659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14659 5236 bytes
SHA-256: de4554cde16704c4342b5157a67961babaee855c9426b68f3dd3ab74afa7fef5
font_01_sfnt_off0001581e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581E 12272 bytes
SHA-256: e88717636a78a35066669081b36c6793c8a42cea14cb4caac8e5b51fb27de3c0

Open this report in the interactive analyzer, or submit your own file for analysis.