Malicious PDF — malware analysis report

Static analysis result for SHA-256 a500c9f0f291ff86…

MALICIOUS

PDF

73.6 KB Created: 2021-02-14 01:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a8891a40b8bba2dbeb3d5b0572107203 SHA-1: fde3b63abd180af1c17083a13eb6781eda6f86e1 SHA-256: a500c9f0f291ff861ae0a5cb6acdb397c8e0d38fc9f7e49befee1e7a5c938f5b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a URL that is presented as 'Spanish 2 final exam answers', a common lure for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URIs and the nature of the lure suggest it is designed to trick users into navigating to a malicious site.

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://jottigo.ru/wix?keyword=spanish+2+final+exam+answers PDF link annotation
    • https://cdn.sqhk.co/vuxesojogugu/ehege8r/funny_prank_call_ideas_for_stores.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/el6VEGH/iphone_speaker_volume_booster_app.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/iaNJjcE/43482971712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5fc5de68b5974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ff76c1d54158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_6003a6374ed3c.pdfIn PDF document text
    • http://wumijodurixemi.22web.org/cnn_entertainment_reporter_salary.pdfIn PDF document text
    • http://cocobuka3.xyz/brittle_deformation_is_different_than_ductile_deformationo3p94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_60251f0db358a.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/wijijUT/runescape_castle_wars_bracelet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366645/normal_5fefef117336f.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/jezibih/ixl_math_login_5th_grade.pdfIn PDF document text
    • http://purpless.vip/platicas_de_seguridad_de_5_minutosf8e10.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/Sjgy2px/pabikiwimugosekati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460982/normal_600914532f6ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5ff6b88d05eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465557/normal_5fe46535bb6a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5feb446f1eec8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzipani.rf.gd/16110604451.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/epistrophy_monk_sheet_music.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5536 bytes
SHA-256: b25153942d9375a278062e5170f4ac56d305a76cfd181c3aa874296fb6dac8ae
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 12764 bytes
SHA-256: cf4fb23615359b6fa307d9aa087cf39069949a453b79fb8a9be5e0ae4387c4e0

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