Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b5833cb1c53081…

MALICIOUS

PDF

75.8 KB Created: 2021-03-14 08:30:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad2a6ca5cc69c6a7c78481a7e471d1c4 SHA-1: 109f2f38a81b3f6d4c562d1713d4c220a055601f SHA-256: a7b5833cb1c53081f056b293c7e37759bcec3818896544995a96ebbec90a2da2
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is `https://vilenefex.ru/123?utm_term=grade+1+free+worksheets+english`, suggesting a lure to download further malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=grade+1+free+worksheets+english PDF link annotation
    • https://cdn.sqhk.co/lipebefaje/42gdGAU/developer_options_android_9_huawei.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/04a1ddb36473ff7.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/gfjbduY/bivokovewunababujopobama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_6043085fd65da.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/fibuwji/my_gf_talking_to_her_ex.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/hneijic/love_failure_ringtones_telugu_download_2019_naa.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/zRiihgY/war_robots_2020_fighting_robots_strikethrough.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/4a294b22fac.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/eojbWjh/patchwork_duvet_cover_king_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_6047008fb7528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_60076174cd21d.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/jqidqjf/lexuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd18b65e4ce3.pdfIn PDF document text
    • https://mosevulex.weebly.com/uploads/1/3/4/8/134860143/9207781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_60157a10ddb8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ffc5e307f4ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/70ff9b14-0701-4254-962c-1a32c617a7fd/how_do_i_reprogram_my_garage_door_keypad_without_a_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb2732a-bbd1-4837-9d56-cd9ac11d23c2/45292307359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da1e29b-7c29-4a7c-806a-ad7711efd615/project_management_certification_classes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66bb439-8a54-45e1-abb4-1d58d53aa3c9/taloxogagewufuzesixob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc454bc2-3418-4a96-ade0-5f21cd068bee/19913530272.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 5196 bytes
SHA-256: 70d249232e9b172b68ac5426a61b553041dad071e833ea8462f39d4d8a9b5fca
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10504 bytes
SHA-256: 19b53f1ba5588327ff29cb56f574a006eb46c79c14de2961989e9a1d59e93fc3
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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