Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f26e9a6a7b56c6…

MALICIOUS

PDF

67.6 KB Created: 2020-11-24 16:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3f86fc619204b6b70a7c3ae543cf3cbc SHA-1: ed24709d2b6ed465fca5022d3abe05f6b00da2c6 SHA-256: 49f26e9a6a7b56c6d890ea88137188fa9cde09a1fab0edccbd18d8bde8552cf8
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links, many of which point to a redirector URL that is known to host malicious content. The presence of a link farm and a redirector suggests an attempt to distribute malware or conduct phishing by luring users to download further content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?utm_term=brunner+medical+surgical+nursing+pdf In PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/rinig-xumabowuj-sarakizevux-rugirevag.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/6f2994e6.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/mofoju.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/potaxun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/koguxulukimiwifexuwulopo.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/wefuxozixozu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/fafogadutitawimogate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57be6253-f3cb-44a5-9bc1-ceabe7a546a6/98075334894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96437b81-a3c2-45dc-b87d-7966f182d3b6/pujetapenubitojoleranid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349dfd5d-70b5-45ca-b670-98134227b9f9/safab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e02a7ca-47c7-4c92-8669-07d477367d8f/95954211210.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/flexcube_core_banking_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2fdbb0-d15e-4288-a3b4-542a1f50e1a6/tisoko.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/51135346975.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/temperature_transmitter_calibration_procedure.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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5524 bytes
SHA-256: 8e65f49c1f2650b1bf84fec619adff82207193d52de841582fd62b8aea7d6768
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10200 bytes
SHA-256: 5afddebe688cf0a5ec10fa5379a89522e5606de8cb8ce459ee59fc30c9db506b

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