Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a1e339e505bcda…

MALICIOUS

PDF

63.1 KB Created: 2020-11-14 00:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0caaa6df7e12bdb93fd76e02f0157017 SHA-1: 3f66efd1dae5afa7edafd7230d9f7a783e096ddb SHA-256: 35a1e339e505bcda784f216a6adc286416da8d1d77b2fd584c738a42f73cdade
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The embedded content, though obfuscated, suggests a lure related to a 'phone conversation worksheet'. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious URL.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/123?utm_term=phone+conversation+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f871d4727e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fa4ab34d3f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_5f9ea99101aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f986f3e9bf25.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/b5a291c8-08db-456e-b55e-5f3367574f7d/pokemon_super_mystery_dungeon_ost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e832653-d83a-4342-b722-0aa99ee3e5b2/girl_scout_cookie_order_form_2018_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/82261852150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7165e6-5504-4989-94d9-3b805181c5e0/delobubet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67548316-c9b9-44d8-b8cb-febf508f6a7b/southdale_movie_theater_mn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c97a8c7-8497-44b8-b3e0-9a29159406d2/mp3_wali_band_matanyo.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/kikedejuwawedajako.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/yo_teach_palms.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_off0000b983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB983 5428 bytes
SHA-256: 6cfdab85415d9accff070efd0a1619572f7c7e31d7edf58f3af6e9753f2c11c3
font_01_sfnt_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 10560 bytes
SHA-256: a4ee07f79fa16329a9ac9526a80f20e93b2195e8db2adac9bea359925be1a729

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