Malicious PDF — malware analysis report

Static analysis result for SHA-256 5559a57e2d336cdc…

MALICIOUS

PDF

107.6 KB Created: 2021-03-31 22:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f44d51e7f087471edd989d83711e9d0 SHA-1: b90b68041b295ea0be4fcf91995b9d0e8edeb685 SHA-256: 5559a57e2d336cdc892b7f485255218d86a7f58bef77b9bd9f3cad6fa0694c53
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains an external URI pointing to a suspicious domain. The document body, though heavily obfuscated, appears to be a lure related to book downloads, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external links indicates a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=brian+weiss+books+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fd63b538eee1.pdf
    • http://sanikeroror.iblogger.org/59631848258.pdf
    • http://paxabak.mypressonline.com/thetford_rv_toilet_parts_31653.pdf
    • http://dusikazo.mypressonline.com/barash_anesthesia_8th_edition.pdf
    • http://xizerunax.scienceontheweb.net/all_major_guitar_chords.pdf
    • http://golixudib.mypressonline.com/the_rime_of_the_ancient_mariner_very_short_summary.pdf
    • http://wiwalubezit.22web.org/beginners_spanish_dictionary.pdf
    • https://cdn-cms.f-static.net/uploads/4465252/normal_603b738e89715.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_60386706e9914.pdf
    • http://bavipame.22web.org/pudaluw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d849e9c4-ffe6-4fe8-845a-b5497ee1841b/decoding_finance_for_beginners.pdf
    • http://xanedemu.onlinewebshop.net/2809055566.pdf
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_63a74fc7aa164ad89c27f8f9e345cdfb.pdf?index=true
    • http://sewejatoxomo.rf.gd/yaseen_sharif_online.pdf
    • https://uploads.strikinglycdn.com/files/f31012c9-b22c-4ac8-a76d-110e7d135176/schwinn_comp_bowflex_parts.pdf
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_a878bf18eae642c38459354b4aa56eed.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153fd.bin
35f40bb30398e49186add5a4607f11d6ac47426783479598443cd5a843ce4c69
pdf-font-stream PDF embedded font (sfnt) at offset 0x153FD 5380 bytes
font_01_sfnt_off00016669.bin
3b3cec01733e2b8dcb0d7b7c067d163f37a058833b715e721d5b630d40e8351a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16669 10636 bytes
font_02_sfnt_off00018ade.bin
b6a6ca5d1ececf9b8f85cf34f243a5152d852bd6c46ff1fd844468d100e5349c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADE 16172 bytes