Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d019ffc465bb0c…

MALICIOUS

PDF

76.8 KB Created: 2021-03-04 20:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 496dda8cd065732cf9e4642a3621414b SHA-1: 53a5e3b9118e127d4fb8805a454f03398451d192 SHA-256: 65d019ffc465bb0c67f4ee09ffb7bfd7f6224eaaa2fd76560fae1c838d5bc138
96 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 an embedded URI pointing to a suspicious domain, 'pelibifir.ru', which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'study guide and intervention'. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=5.3+study+guide+and+intervention PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422134/normal_600b749e16145.pdfIn PDF document text
    • https://nulazonale.weebly.com/uploads/1/3/4/8/134892754/283ce0a2f2375.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/momafi-dogexitimuvif.pdfIn PDF document text
    • https://jegasujarirulif.weebly.com/uploads/1/3/4/7/134720127/zobutarobimerarugine.pdfIn PDF document text
    • http://subaxidubuju.22web.org/23120097908.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/mount_and_blade_warband_serial_key_crack.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/cda9316e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469386/normal_5fdd860bc81d3.pdfIn PDF document text
    • https://sirawosoze.weebly.com/uploads/1/3/0/7/130776152/fojupiwujazaf.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/3404395710.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/de3e6999-6dc4-42f7-95d7-5864940c65ec/sirevasavodaf.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/63952411804.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/petizotorasibaweseseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9101d22-e2a7-449c-b66e-84aae872ba37/50079252496.pdfIn PDF document text
    • http://giwofigu.epizy.com/gixilavutemokuke.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/cidco_lottery_result_kharghar_ews.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/thick_flannelette_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/watermelon_radish_nutritional_information.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/zunubipu.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/risijimebifimesudesaz.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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5348 bytes
SHA-256: 37419ad7243a4ba93a5ca8b8acd0f021592e76e66fd707f3835cf5f18ae73c53
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10624 bytes
SHA-256: 561969a4f14863b748bc859e9aecdd9b298f732e3dfd26bdafc9b9553037bd51

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