Malicious PDF — malware analysis report

Static analysis result for SHA-256 850cbc976f768950…

MALICIOUS

PDF

78.0 KB Created: 2020-12-04 23:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08fa70c969fce074fbd457d5da5e5599 SHA-1: b807c165d51c55724435f1e3d4f582ffb3ec73b8 SHA-256: 850cbc976f768950938254d0f5053386fa32e9037ced07837432b79e57eee82c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The embedded URL, 'https://traffine.ru/aws?utm_term=spotify+premium+apk+samsung', strongly suggests a phishing attempt, likely to trick users into downloading malware disguised as 'Spotify premium apk'. No scripts were extracted, but the PDF structure and URL are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=spotify+premium+apk+samsung PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5fc5ec3646ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_5fb31bf40beef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5f967ddd2af77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fc987ced3c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5f989b20e8f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469136/normal_5fc79944c0445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_5f979ef2785cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_5fafaa693734b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5fc410b9d64e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f950c8160b96.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/1f9b25c0-e88c-431a-a9cf-72adb77f6324/what_is_a_fractured_fairy_tale_powerpoint.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb4c6a371610b8775cd3/1606220621810/peter_singers_argument_on_famine_affluence_and_morality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449e2584-35cb-44e4-b535-be116ccbe91c/wiganefezujakuvuvemeg.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 5456 bytes
SHA-256: 25f44474c65354ffd1b086107e50fedcb9d70d851fe5294de55fbc95995dc12b
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 10932 bytes
SHA-256: 3cbf3a2f283920ba771aab6b66dc8bf772cea04e29f74e57068d87f93f132ceb
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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