Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73dc0637d0d94b3…

MALICIOUS

PDF

73.6 KB Created: 2021-03-20 21:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 35ed1d915cd0943d4c75abe960ccd623 SHA-1: 040b52f646de015b37d97ccfcd073d7b23348980 SHA-256: a73dc0637d0d94b3dd837dfcdd0f0f4300b8d463a291fcf0840b5c686fc931ee
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious and likely phishing-related. It contains an embedded URI pointing to 'https://vilenefex.ru/wix?keyword=physics+guide+ib', which is likely the malicious payload delivery mechanism. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=physics+guide+ib PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421944/normal_601491467167c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_60130f1d58967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_603fd5e3d9e63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepejovunera.rf.gd/mugebevutilukadewoti.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/princeton_review_sat_practice_test_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/update_listview_android_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa79e55-e428-4af0-81fa-7a265518b696/the_sign_and_the_seal_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/drakensang_the_river_of_time_class_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132222ff-eb69-43a8-9762-c18ea62e902e/48918264389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d7c2be-78ed-4763-8223-b70da98c434d/sevawerabesuvuvelonit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57053310-5843-4224-9686-635911eed6a4/moto_g6_screen_protector_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ec418f-8088-409a-94f9-5eb35290c0d6/jesabajudogofafuzuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27ec466-b6ff-4c85-b26d-eef839da2fa4/xuzudurexesa.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/56923548532.pdfIn PDF document text
    • http://birotizedu.epizy.com/49114636393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818f730a-eb0a-49e3-a200-5a4c7482b52b/36145850779.pdfIn PDF document text
    • http://dawubiri.rf.gd/definition_of_management_accounting_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f59cf6b-74df-4d1b-9f73-bc5e6707b2f0/deadliest_hand_to_hand_combat_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/somuxase.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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 5104 bytes
SHA-256: 32cf9d20b2e5dc7449dcd7f9c7e10e2ca466e2493d3f310cc5ae10915a00c363
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 10152 bytes
SHA-256: 8a7443a875496ec45067117348a634a7226a089238285d3c1039ab94b54ff434

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