Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ebb654f37510ad…

MALICIOUS

PDF

66.0 KB Created: 2021-02-15 05:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e508b5bd52703ce0daa2bc945782cd18 SHA-1: 975f0a7e2cd8f7b895e947e7ec374e60199b2548 SHA-256: f3ebb654f37510ade31c4ac5185e9e6d1c97fee586daac8d28612d08cc50a3b1
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=mares+puck+manual PDF link annotation
    • http://praktika-ingenieur.com/barewejufijube1tc5.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/3230458.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/egdifyj/my_fishing_life_shirts.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/Imjigd2/35136759607.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/2860291.pdfIn PDF document text
    • http://amst-watch-v1.club/pdf_watermark_remover_online_tool36mqi.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/b1c1fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fdc44ef739b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fd16ff422860.pdfIn PDF document text
    • https://sidunijutama.weebly.com/uploads/1/3/1/1/131163786/sofakasi-subadomarigo-pudipalatutete-dafowup.pdfIn PDF document text
    • http://itfamily.info/shogun_method_free4s63g.pdfIn PDF document text
    • http://kreativoblako.com/825336049094yvcm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_60198469aa9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_601e0c6608b20.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/jiEZBid/32873930645.pdfIn PDF document text
    • https://cdn.sqhk.co/fegokirar/scGgeUc/62744908720.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/jhN8JyQ/weekend_update_sat_night_live.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/xedewofuretujo/budget_report_definition_in_finance.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/huawei_p10_lite_android_8._0.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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 5148 bytes
SHA-256: 4f8b65a0392dec2b6db02abff060f49c9df1bcee185c8e595841340e208e4bf6
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10144 bytes
SHA-256: b2c44857bb6a7e538bed5d734d2560cd2656cc44015bc3af872ff360fedc1680