Malicious PDF — malware analysis report

Static analysis result for SHA-256 616cf39f150acc79…

MALICIOUS

PDF

75.0 KB Created: 2021-03-31 06:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 672c43f17a03f471e0d7e0da6c9de000 SHA-1: 76845b831af36d2fa68394f9d6cf7551d703b549 SHA-256: 616cf39f150acc79a9eacbc55b7868739706004bc1ca34363551ae9b9c29cb32
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 URIs, with at least one pointing to a suspicious domain ('jumiwimov.ru') that is likely used to host malicious content or redirect to phishing pages. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=aha+guidelines+pulmonary+arterial+hypertension PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490547/normal_603ed899b4f46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ffa77e240b5f.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/greek_root_words_worksheets_4th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_6023d574e0125.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/gmat_mba.pdfIn PDF document text
    • http://femalukus.iblogger.org/by_the_way_bass.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/job_analysis_and_design_project_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_605abb5d75caa.pdfIn PDF document text
    • http://nuxipawuxodiwa.getenjoyment.net/unisa_application_forms_for_teaching.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb2c6eb-c634-4449-b1fd-06e9e4702e3a/samsung_q7fn_55_wall_mount.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_e2cb702aa05944e294c569c84bbd9e02.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_9023ec48f9ba4e1aa37b807937646b5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/31284909995.pdfIn PDF document text
    • http://juborekif.atwebpages.com/24638950872.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/best_android_tablet_deals_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d4615c-cf6d-4d0b-87e7-d9649432c0a7/mogimi.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/orbit_sprinkler_timer_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be7ce0d-ad9e-4bf9-9597-69220d5dc334/53234751962.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/intellitone_pro_200_toner_and_probe_kit.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1910948ec95b4f80bac213f0218eab1e.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5464 bytes
SHA-256: 06314017f04e3920ef964bd226b24d920f1dd3faff63c182e6db6799fd5b9ef1
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10964 bytes
SHA-256: 8a8ea8c1c40765cec5cc458a0af4489f51761349d50c6e69b7c1b7c7fd9714cc

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