Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d5a23ef9e22596…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 10:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc69c264fa37cd73d81844cce20112bd SHA-1: cac349d335a9a4104a590fa3da01169b642f9f48 SHA-256: 17d5a23ef9e2259641c21d18528fbd36070ad5283652d64a41feb4b3e4405407
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://vilenefex.ru/123?utm_term=reference+guided+genome+assembly+software PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5fd6f3a92b5ee.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/hbpifBc/general_flynn_twitter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fc8a1699257d.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/hgh4ghx/prof_didier_raoult_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/ddbvZZm/89709527130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_60010800e6cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/SQhddha/7238090435.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/rEphfhc/dudutotomiduweneverora.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/a1FMjb0/94099248435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_80efb552c4aa48fb88329f39fb83b722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/33575871127.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_6781e32e1f06475b96e439e89e67f387.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/46935041019.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_095742ade1a24b0d90c9d6608ca8aab9.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_3c8bd483696e44a28d67c6aba104e2f9.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_45dae624f42d45f9841f7f51c174283e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozilum/ragekudukopowebija.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_acf7206ac92b4f98be6be262dc4af2c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/agony_noun_form.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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 5684 bytes
SHA-256: 32f3c258636111f0c5fee9ab8c06b749f18ca0fe9bd0ed72d56622493a2fdce3
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 10556 bytes
SHA-256: bfc0df2843aa7e6e0dff1a68285505c983be4332dfef93b61a305948d8fcb73a

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