Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90be67d47f72e7c…

MALICIOUS

PDF

77.1 KB Created: 2020-11-23 09:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f2408f0e1a1096943218b52c98f5cfb SHA-1: 1ef9ed9bf7c02b124683c77251c51e06fa3b822a SHA-256: b90be67d47f72e7cf31d2bcbc5dd4ab1d898cef0d7e271a538ec938c4a174260
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of malicious URLs and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/123?utm_term=imperialism+political+cartoon+explanation In PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/3790007.pdfIn PDF document text
    • https://xinotojopafexiz.weebly.com/uploads/1/3/4/3/134316842/a0ac5c0560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f9ae6bd861b7.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/wutisigila/73864106040.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/tyrone_unblocked_games_balloon_td.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757e58ce-482a-4abc-9aab-c8cecbbf9efa/kuzezuba.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/86734347251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63001ecb-2cf5-4d4d-81f2-54ca57da8ffe/netters_clinical_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d888e299-9599-455f-9c17-059bbc543d26/81285432555.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/translation_reflection_rotation_worksheet_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65a3e01-7720-4458-a919-da6f5feb8f02/51229488519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed1f700-cc75-46b5-b2b4-c366c054d1f2/elevation_map_portland_or.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05170970-6e23-4671-9fdb-c63d903cbc1e/fapuvakasaketewuv.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fec7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFEC7 22896 bytes
SHA-256: 678735753a7f50b5efdddf90724e2b67c2cc69866cdaff006dd1e2da522286ff
font_00_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 5084 bytes
SHA-256: 2fab09f993462371588d23bec702dbcc0f1ce0d994f4d5d3bb04bac90e562e35
font_01_sfnt_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 11252 bytes
SHA-256: 5a0cb04939e4536a1c4c766dc8e73e3bbcedff51a78912222a55c5596a646876

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