Malicious PDF — malware analysis report

Static analysis result for SHA-256 b353572054900228…

MALICIOUS

PDF

104.2 KB Created: 2021-04-20 22:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2583d3ecad170b5bb72d1a58f729e23f SHA-1: 2c454b274e1e4ef99f6adc3c9e9233117db00bdf SHA-256: b353572054900228317a4ce1a072669fe9008bdc5c732053c6672230bc591c8e
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with one prominent URL pointing to 'leonvi.ru' and appearing to be part of a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The document's structure and embedded links suggest it is used as a lure for phishing or to distribute further malware.

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/strik?utm_term=midland+texas+trucking+jobs PDF link annotation
    • https://cdn.sqhk.co/judawube/iudhbhj/potabi.pdfIn PDF document text
    • http://winoorama.space/yamaha_mg10_manual_espaolcdzsa.pdfIn PDF document text
    • http://keto-menu.online/manufacturing_balance_sheetgszcg.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/gaxozuvinuselafem.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/xufudakidiguw.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/61447894676oms2l.pdfIn PDF document text
    • http://wexypay.icu/cooking_mama_2_recipesgw82k.pdfIn PDF document text
    • http://lg-supportteam.com/77880565358291we.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • http://vofufime.mypressonline.com/30742821189.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/aOFijbp/19576010566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/benmoon_ayurveda_plan.pdfIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_3de24757023d49cd846409e472611af3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de4f3c2-983e-4a82-a6fa-a9a443b65258/kakutipabadifosinupamu.pdfIn PDF document text
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_0c50a85d361f4da98ef5acf0edad55a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/757a768f-ffd4-4ca2-9afb-4b5448db1de8/dork_diaries_author_biography.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_3b526644c9684f20a6f6501ecaa488aa.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_3e42d8fec92d480d9b6bc92583d80756.pdf?index=trueIn 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_off000155fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FA 5460 bytes
SHA-256: 342808f5e51cc809a2cfe13c9904fe8273020140bd2fa39577f8bd929ad04ce8
font_01_sfnt_off000168b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B1 12328 bytes
SHA-256: 5793ea2570d4fef356cfeaac885141dce82037ac68b05f3a407b72fbe8e6fab1

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