Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f662d9f5a75f93a…

MALICIOUS

PDF

76.8 KB Created: 2021-05-18 22:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 08dd7a0022ad18dcadaa49ea37ff18de SHA-1: 71a885f9f3dd5bf8affb6517674753bb77ea3278 SHA-256: 8f662d9f5a75f93a27c425418a7ea03cd42d7481147607fd4fbd713b7fa06cd6
186 Risk Score

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 0.9995

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://dafemum.ru/strik?utm_term=yaz%25C4%25B1y%25C4%25B1+%25C5%259Fekilli+yazma PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5fcdc3564b7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_5fe799813b605.pdfIn PDF document text
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/raxazijaxikedoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fd2669c2b79b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_60677439d9c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_603cea58d5d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_605a23bab78ee.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/cd669b02c2601.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/rizisuz.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/2789532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_6048a2f930fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_605b6cee2223b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_605514714dff7.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/vofadoloves/xulawugaravupalufozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25677284-098a-4357-9cd4-37556288b8c5/pathfinder_wiki_adventure_paths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f4e4c6-0900-4cb7-bde7-626488b11173/wewefizulewobok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2231c006-612d-4d63-8a34-e0eb4b0813ff/29749238243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7181bd-800f-4d76-986f-a0b74e01fbf5/how_to_use_mophie_juice_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54204b14-1f50-4e1c-baec-1a467b0f221c/56884029136.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/71159857777.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/whatsapp_lite_for_nokia_3310.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/different_types_of_surgical_knots.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 5016 bytes
SHA-256: 6919cccf39778c2d255619880da1fab3df8a6ba616f110ad604ac278232e1895
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 11904 bytes
SHA-256: 7217f9d167a7d9d58622e11c908d1f770c4044a070e0b0ca42be603462d7e0d1
font_02_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 16844 bytes
SHA-256: 728f52566a6b306094a559f7c5bc8f6d8ce886a1337f05d4f8ad486d3c6c6974