Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e77029b990f3e28…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 03:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d5faef65a8b6604145261e661fbbb366 SHA-1: a46b432c85cc5c2b4748050bdcef3ba1b5e1416e SHA-256: 6e77029b990f3e288f0d7898f4a71a5ad628e5521ce22cab9fa31bfb46fc943d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are flagged as unknown or potentially malicious, and is identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://xajibur.ru/strik?utm_term=zero+belly+diet+recipes+free+online PDF link annotation
    • http://vnatural.space/behold_a_pale_horse_download989i6.pdfIn PDF document text
    • http://kernig.store/spelling_numbers_1_to_100_worksheetsojld6.pdfIn PDF document text
    • http://godumos.22web.org/75537813767.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/tibafidilarufejowo.pdfIn PDF document text
    • http://okstore.info/60770392252yfi3t.pdfIn PDF document text
    • http://meetcabinets.xyz/rawazibomixururlr8d.pdfIn PDF document text
    • http://podjem2.club/28099805104w4936.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/5804331.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/what_is_20000_leagues_under_the_seaxc6yx.pdfIn PDF document text
    • http://jiludedo.iblogger.org/65626714473.pdfIn PDF document text
    • http://mastera-saydinga.ru/229310487sy82q.pdfIn PDF document text
    • http://bupomorefa.22web.org/80659671205.pdfIn PDF document text
    • http://fbcopyright-center.com/rufus_usb_bootable_softwareyqztt.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/e246111f-1c90-4d98-8aac-dc440b6c0e7e/mogofimowasuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc3c242-d205-4486-bf41-0f1019c5c6a8/sevilugokit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726e1460-1c87-4480-a65a-23a0e7dd007a/katit.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 5136 bytes
SHA-256: 8ed437633eaf2f36250311103574ee9bc87f255ae3e7ac781e7f682a7de8b3b3
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 11668 bytes
SHA-256: 888443178f3c25f6ae762c154cce7bbfc596f29f05fd2be75d8797ccf2ada347

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