Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f624d67622f9e0d…

MALICIOUS

PDF

81.0 KB Created: 2021-02-22 21:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a22a2fa788f3cd8d8071252bb8244db8 SHA-1: 5fc3cda378f533db5d2abb22a7a0cd1a6b2fa29d SHA-256: 9f624d67622f9e0df32215318c303f714e5d5b3d6fefccf82d5410cf53c4450b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://leonvi.ru/wix?keyword=forms+of+energy+answer+key PDF link annotation
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/7122189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446917/normal_6012f95e94eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_60241571a5327.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/9402807.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/bhhhggf/42550233108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_60308c3b5ebe2.pdfIn PDF document text
    • https://detifurotuso.weebly.com/uploads/1/3/5/3/135321595/87877d91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_6002605374441.pdfIn PDF document text
    • http://ibkreactiva2020.com/the_bell_jar_ch_5_summary15otm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502563/normal_5ffc1f94d3669.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/dv0hid8/jevazatojenidirilopadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5ff3d2278231a.pdfIn PDF document text
    • https://bezuwodasufex.weebly.com/uploads/1/3/2/6/132696249/natijigunikoge.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/8Bic8ij/formula_1_manager_game_ipad.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/lolaritemukole/jusafedaka.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/chrome_free_for_windows_xp_sp3.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/mazetaworezajaluxalaf.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/aristotle_poetics_analysis_shmoop.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_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 5268 bytes
SHA-256: 0bb0fc39a62ae636d3ca37585c3f99ca42d8479ac7540c6ce1d5502bdc4d9c9e
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 11536 bytes
SHA-256: 7cdadce5706be5026d57ae2563a866ee25471bc33360d4c643fd74f50fd2319d