Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4584d59ea8c8513…

MALICIOUS

PDF

74.0 KB Created: 2021-04-20 11:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a87b3e2bd32c7aca2556f6e9f0c77c94 SHA-1: 91c5a0bcfe05f0e3974d441f7d7c81ad09c8c9e0 SHA-256: b4584d59ea8c8513543d8ce76fca191e5a9892bbe3a39a7d82e3f48930fcd629
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://ponafet.ru/strik?utm_term=reinforced+concrete+design+book+philippines PDF link annotation
    • http://jekenufakewe.mypressonline.com/35704998475.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/dfc59e9a27401.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/153078dcd2.pdfIn PDF document text
    • https://bagugesi.weebly.com/uploads/1/3/0/7/130775983/zujatavazunujawit.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/gixab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_602c26d1d9912.pdfIn PDF document text
    • https://cdn.sqhk.co/dafiwexoki/tgghggi/informal_contractions_worksheet.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/4684778.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/twin_star_international_fireplace_heater.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff21d9e91bbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5ffccbaae354f.pdfIn PDF document text
    • http://resufomuvojos.22web.org/misonex.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/0jfhaic/88387291655.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/QifTbGD/16335502478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc5c008-b17f-42ac-bef9-a580ad3207cc/the_tragedy_of_romeo_and_juliet_act_1_vocabulary_warm_up_exercises_answers.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/tejokikukaduxilu.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/putupimawudegibejivevifew.pdfIn PDF document text
    • http://luniluwanurezu.rf.gd/quadratische_gleichungen_bungen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95354107-d774-4894-99b2-dc1965a5c78d/4246063203.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_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 5416 bytes
SHA-256: fa0c7ac36d5aa4c5b10e87f4aa8b962ffd1e55790c8d7817c00578860b7ed809
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10668 bytes
SHA-256: da8289f06c6622a9a671e1da8f69ee699ad5128e0e243c204367810cd5206ce6

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