Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f1d8e4870b7835…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 01:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 223a586f5829b1d51afea75c1da0a112 SHA-1: 412ca34bab40afa2c7e9dbf5da5725d622b82210 SHA-256: 45f1d8e4870b783531a684b1db8602617b62a2d6c2d48a37b1a691af6ab3cad2
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'pelibifir.ru', which is likely part of a phishing lure. The document body, though heavily obfuscated, suggests a theme related to 'international magazine layout', reinforcing the phishing pretext. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing attack.

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/award?keyword=international+magazine+layout+pdf PDF link annotation
    • http://jijipefifi.iblogger.org/sajarusivabigoxafuzoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_601ede60dfebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff4e2f394cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd273f2f06c5.pdfIn PDF document text
    • http://tuzurew.iblogger.org/animal_farm_chapter_review_questions_and_answers.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/nikalalefidenetudomexuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_604e5452d1621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxexagixib.rf.gd/split_into_pages_mac.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/management_system_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/nepufegosivile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc38a5b-1664-477d-b970-3b1bcc5d3937/teoria_del_conflicto_realista_favoritismo_endogrupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a2be7b-ee69-4957-9c1c-b774c3693bb4/24287473635.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/blood_group_abo.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_5606ee8250d743a5aea2865145761426.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_ae2f06412f26404789a726df670e98ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01130ffe-ef94-4b35-a347-608accbc9c08/94410086246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94ea8b8-c0ef-4921-8982-296ef525ac7f/xujupukodikemakawowigimax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961a874e-48f3-43be-91a6-656b4b2e389e/57961447079.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/which_machine_learning_algorithms_to_use.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/garixinexisupovuba.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/who_owns_beretta.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/charitable_giving_strategies_after_tax_reform.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_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 5272 bytes
SHA-256: 61254560541ac3e0e5f6b2e0ba2ae90d29bf3189a93146a20713a98d87a28bca
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10420 bytes
SHA-256: e74f91210f5eaa1bc825c38bc331e4ddfe45b47f673a0e478a1cd68e2d424eac

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