Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bb2e225b6cf2e0…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 23:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dc1492f93fba7eae1527e8619e4330b8 SHA-1: a9dc42100c012a6b0ed623807750bec432682080 SHA-256: 66bb2e225b6cf2e01b52228537ecbd75871a70396566517b7637baba34c65227
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains keywords related to concrete pouring, suggesting a lure to disguise the malicious intent.

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
  • 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://jacksth.ru/strik?utm_term=pouring+concrete+in+cold+weather+uk PDF link annotation
    • http://tepafuvofes.iblogger.org/english_conversation_for_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcba2925f19c.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/fjbI4gg/home_depot_sheetrock_repair.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/TdgdB8s/75196872830.pdfIn PDF document text
    • http://fusizexa.22web.org/twerski_addictive_thinking.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/jcpKwgj/46028435117.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/1qNDCge/neighbors_2_sorority_rising_parents_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_605401495b95d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501989/normal_5fe10921a95e3.pdfIn PDF document text
    • http://dapunajav.22web.org/imminent_lawless_action_test_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_601c99065ce82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_2d0ba086027840fc87eeaccf7f3e791a.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_c9fa9ab20b16400ba0ab1361f803a5d9.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_8d6d71ca081442bc93a9f9ed6a05c53a.pdf?index=trueIn PDF document text
    • http://bosotosevizava.rf.gd/night_auditor_duties.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/photoshop_show_transform_bounding_box.pdfIn PDF document text
    • http://salilizuvozel.rf.gd/canon_5d_mark_iv_manual_focus.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_12046efd61ba42a9864b4a8b77d21bf4.pdf?index=trueIn PDF document text
    • http://sozuwag.epizy.com/54247571531.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_5ad56b206e9247a8be45989d38df8315.pdf?index=trueIn PDF document text
    • http://wewapozolebupo.epizy.com/fofanalatedesataxawilim.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 5180 bytes
SHA-256: 3ef84d9b22c2a8b4442e387c7f0991b93b1fca657a50f349604cf50ffe9ddaa8
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 11580 bytes
SHA-256: c44c46d9cdc5686a6db49348dc7de17fe18c5511afebd0a1c3c13f6ad98891b7

Open this report in the interactive analyzer, or submit your own file for analysis.