Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1be5e00448d6de…

MALICIOUS

PDF

72.7 KB Created: 2021-02-13 11:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 316b3da78ac0622e0dc371e28f9da628 SHA-1: 2b9f70082f224308315a5339f3466966d2336f0c SHA-256: 7f1be5e00448d6dee109a401aede7e8e06a41c8f41faca56faad2698345cf233
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to 'https://maypoin.ru/wb?keyword=question%20form%20of%20past%20continuous%20tense', which is likely a phishing or malware distribution lure. The document body, though heavily obfuscated, suggests a pretext related to a 'question form'. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly indicate a malicious intent, likely spearphishing.

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://maypoin.ru/wb?keyword=question%20form%20of%20past%20continuous%20tense PDF link annotation
    • http://vebilodugisugod.iblogger.org/clearance_certificate_form.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jc5GgfY/space_rocket_simulator_online.pdfIn PDF document text
    • http://daimontimur.org/miastenia_gravis5g1hh.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/fcrYiet/judelube.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/rifhhhf/kewolekezotapot.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/4idgelA/i_wish_grandpas_never_died_lyrics_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ffd766190d81.pdfIn PDF document text
    • http://promooffer.site/34694310765tnz8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_5fdc4413dd539.pdfIn PDF document text
    • http://anarchymedya.com/vivaldi_summer_presto_piano_sheet_musicacs2w.pdfIn PDF document text
    • http://lidlid.xyz/nurenesakag764f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fd1703db7c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_601e646e30f5e.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://s3.amazonaws.com/fukezavazuj/dadiwizixuxemumefom.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/conceptual_physics_answers_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/nabizizaluzimufonupevas.pdfIn PDF document text
    • http://jemumanapumaze.epizy.com/75877335714.pdfIn PDF document text
    • http://rapabilalame.rf.gd/cyber_hunter_android_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/wugewigepuposu.pdfIn PDF document text
    • http://femomebokubogom.epizy.com/axcrypt_1._x.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_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 5072 bytes
SHA-256: f3b129eb9440debf0921b5e3411e2c3c99c4b5ece4429109c1a0552639f4cb65
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10068 bytes
SHA-256: 94c569f757be3dcd384efe9cfc034d9c3faff69debb989c93b80febfeac7873a
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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