Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403bfc4f4415e6e…

MALICIOUS

PDF

70.8 KB Created: 2021-06-11 05:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22d820bb8b4c94e4f1b0bbdf264e50cc SHA-1: 27eb0a49ed071971743b37f6b9c91431f425742a SHA-256: c403bfc4f4415e6e9cc73f0edcf57888f89e0823d4a9780aa3c0ec4b511f703a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/pbw?utm_term=biostatistical+analysis+zar+pdf PDF link annotation
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/6925422.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/e2a022cfabc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ditawulajobu.pbworks.com/f/3877013442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44581cfc-083b-44ca-a21a-ca3ab3222bb2/wimigikinoluzogutubovaxad.pdfIn PDF document text
    • http://gutopevif.pbworks.com/w/file/fetch/145097955/73789385849.pdfIn PDF document text
    • http://piwomimagito.pbworks.com/w/file/fetch/144841557/difference_between_synchronous_and_asynchronous_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a4aac7-1392-4f7f-ba2b-4d0ea96bb0bb/directv_code_for_olevia_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fae71b-b45a-435e-aefa-bf122e0ac586/22196863864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edf2364-c64f-4d0c-a888-c4fb8dab034b/how_to_repair_singer_machine.pdfIn PDF document text
    • http://joromonepa.pbworks.com/w/file/fetch/144823320/dorelujibatosofe.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144427740/igbo_gospel_songs_mixtape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590ec68e-8c83-46d9-9ab3-b99f197d190c/24790833316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28e5c38-2f00-4583-a01e-103f2fc22847/bomiguvuvifufokekikuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3930ca-3a6e-40f0-ab48-cee4f11bc7c4/jack_lalanne_juicer_customer_service.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144873423/datosofuluxuvavolal.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/44415051684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e4616b-9c9d-40f8-bd54-3e1f0b614265/56067147095.pdfIn PDF document text
    • http://kemususi.pbworks.com/w/file/fetch/144751521/craigslist_northern_michigan_tools_for_sale_by_owner.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 5352 bytes
SHA-256: 31e278cc61a5ea0f49ac4c23efb6c1927294728bef81dbf1de68b34f611c934a
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10716 bytes
SHA-256: 295534eff9de3a6d0bb2147d73726fce307986f862f9e1dff97d28dadf1c4aa3

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