Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a97eb263cd3c66…

MALICIOUS

PDF

78.3 KB Created: 2021-06-04 08:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b0587d8c30ca625536fd28466564ac61 SHA-1: 26c31bee8462bfa3c35d24fd15fd8744670cc7ec SHA-256: c8a97eb263cd3c66309f3c86e22bd0bac9cd13fa190ecffbbd3f9d5a27656906
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that mimics a search query, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://cructi.ru/pbw?utm_term=how+do+i+manually+update+my+old+kindle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421641/normal_603c446cde828.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421210/normal_60b05f53ca562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144520821/migidozuwezoroboxaguba.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/peter_lynch_beating_the_street_reddit.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/wrong_turn_2_movie_in_hindi_download_720p.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144448200/rigozifasumejifemilok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31090336-d71e-4cfc-a020-1a7a84790624/bleach_capitulo_199_audio_espaol_latino_facebook.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144427707/zanitulipunusapepux.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144418665/58265098320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f509b775-0787-4dbd-89bb-ee00ac754dc2/gre_verbal_reasoning_practice_test.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/76908060681.pdfIn PDF document text
    • http://redejok.pbworks.com/f/saripat.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/70395082277.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144596799/76356066832.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/f/jelapifapasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d6539b-e805-4d82-851b-b60732662e3e/murray_push_mower.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/dexuto.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144582786/rejotodidavurobefusigipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af793a60-cd9c-4063-997c-39165762c17f/67488030032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00d211b-fdd7-459e-9753-6853189a37f5/lemevuritevizupid.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/what_to_say_in_pip_mandatory_reconsideration_letter.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_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 5052 bytes
SHA-256: fe1d1d26c6f8c331eac3d540f0abd5a0b5963e55b3ba97288fe1fe052403cf96
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10944 bytes
SHA-256: 998a5066919abd29d3f6bb9b1a5bd6d78833c4fe13a5371204926635ad531d72

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