Malicious PDF — malware analysis report

Static analysis result for SHA-256 903782e8e87378d1…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 05:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1226129d7620b78b08b359383d219cf7 SHA-1: 9ba34e07ffac6e943d2f7fe705b1150aa8ceaec3 SHA-256: 903782e8e87378d1aa9c2b128c5664ce33fd076ae8edb502ecaf9d8a96025b72
136 Risk Score

Malware Insights

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

The file is a PDF that was flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic SE_PASSWORD_ARCHIVE_LURE indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://pisumuvate.sportsontheweb.net/oxford_student_s_mathematics_dictionary.pdf
    • https://cdn.sqhk.co/safubuguva/hacdsid/mobile_legends_bang_bang_tier_list_july_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4369796/normal_60079fc92418c.pdf
    • https://cdn.sqhk.co/vimitewimuwi/nJhiPM3/canteen_services.pdf
    • https://static.s123-cdn-static.com/uploads/4443357/normal_5fe0d34b30fc8.pdf
    • http://lezeninimi.medianewsonline.com/whats_the_difference_between_jbl_charge_4_and_flip_5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=como%20hacer%20un%20anexo%20en%20un%20proyecto
    • https://uploads.strikinglycdn.com/files/7bb409ab-a42b-4e4b-a858-a5ce743a4998/rofapole.pdf
    • https://s3.amazonaws.com/lovetijif/51142251351.pdf
    • https://s3.amazonaws.com/vibasujefir/78007478840.pdf
    • https://uploads.strikinglycdn.com/files/4720471b-0550-41e7-b24d-86e92bfcfe32/yoga_workout_for_lower_back_pain.pdf
    • https://s3.amazonaws.com/degisapemifa/anywhere_travel_guide_opdrachten.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/vufotinagifepanomi.pdf
    • https://uploads.strikinglycdn.com/files/79859722-54cb-4f18-8ae6-d60b85ce14de/67710048030.pdf
    • https://s3.amazonaws.com/zurovajij/elizabeth_arden_foundation_colour_guide.pdf
    • https://s3.amazonaws.com/jokotaziweluge/ccna_lab_manual_2016.pdf
    • https://uploads.strikinglycdn.com/files/04df12b3-c977-4ab3-9f8c-ee2ef14c222c/41093273275.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83e.bin
1889002ae966b2dd33621173863c6820e23627774bbb6a253b50a58ca2e07d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 4992 bytes
font_01_sfnt_off0000f913.bin
97002a0c4c555c06ab503b6d6e6925affd8a3bde712119f49c92104b81612103		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11744 bytes
font_02_sfnt_off00011f32.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 4324 bytes

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