Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac91cc80fe053d1…

MALICIOUS

PDF

74.2 KB Created: 2021-02-16 18:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68c4d18f4e75205cd4c9b2d3cd6da02 SHA-1: 5e9a59a98962f31e869480721b2783b61b76b9b3 SHA-256: fac91cc80fe053d14c02fa1476a7f54d692ee716d12db9a524b2c142cf43d908
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 phishing or trojan threat. It contains an embedded URI pointing to a URL that appears to be a lure for downloading a study guide, suggesting a social engineering tactic. The presence of multiple external URLs further supports the likelihood of this document being used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=cwna-107+study+guide+pdf+download
    • http://eurozone.pro/rtog_contouring_guidelines_head_and_neckjht2g.pdf
    • http://fenofaxizuva.22web.org/mitosis_cell_division_station_activity_answer_key.pdf
    • http://bestcreditcheck.info/pavetaxugolivuf783b0.pdf
    • http://zalavsky.ru/jitugepwxhun.pdf
    • http://mestorating.ru/796201790454nyr9.pdf
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/somoradu.pdf
    • http://korecos.ru/smm_shanghai_metals_marketjvad6.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/liveteres_menupajevogevi_wovijadorizufi_vidufomix.pdf
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/7811687.pdf
    • http://safetymirrors.xyz/dropwizard_tutorial_intellijao4ve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vufagozujidivu.epizy.com/vasiputedujagaxi.pdf
    • http://rovetenexosa.rf.gd/writing_chemical_equations_worksheet_answers.pdf
    • http://saziwujezad.epizy.com/blowback_chalmers_johnson.pdf
    • http://mitefunigesito.rf.gd/wedding_anniversary_wishes_for_husband_video.pdf
    • http://residarifuwus.rf.gd/c_o_n_full_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e386.bin
529733a1b786d35d6d53a0ac2055d474b6ca338df67059c67c80eac6a6917f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5520 bytes
font_01_sfnt_off0000f699.bin
a69f2e7dd4daafcf54f5343e0d273e588ed228faa18a97d7c69ce082c9ed8012		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 11160 bytes

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