Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bbe82ae8cfb642…

MALICIOUS

PDF

67.5 KB Created: 2020-12-15 23:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ede836d8a95322319127324aa5a00f7 SHA-1: 197723b3eb8f5242b45e7f699ddb4a602b1b4ed0 SHA-256: 27bbe82ae8cfb6425e9b1219744487b4c27750f944b6d51bdac4444e60065ac4
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL and a heuristic indicating a visual download button, suggesting a social engineering attempt to trick the user into downloading a payload. The presence of external URIs and the ML classification strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=answer+roller+gear+bag
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fb73edfb1067.pdf
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8ac40b328aa.pdf
    • https://cdn-cms.f-static.net/uploads/4462352/normal_5fa92fa6b27f2.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/0356d367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc58e5668612547ed7d9951/t/5fd70d2fab77727176a6a737/1607929135797/crystal_report_10._2._36.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2126310eb142c7f2361f/1606230310723/mole_ratio_worksheet.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/kyocera_3551ci_spec_sheet.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/bezazabe.pdf
    • https://s3.amazonaws.com/baposivarabuj/alternatives_conomiques_2017.pdf
    • https://static1.squarespace.com/static/5fc5180827a199023ad07c53/t/5fc5e573eaf37e3b64682829/1606804864813/trigonometry_for_dummies.pdf
    • https://static1.squarespace.com/static/5fc4d0d3a3bf4b14abc221fa/t/5fc86c686652ad59ec28ab1a/1606970473472/penajodomux.pdf
    • https://s3.amazonaws.com/kiwopusafize/media_player_android_tv_box.pdf
    • https://s3.amazonaws.com/tesodagiwor/88666754375.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_off0000cb76.bin
8ab373e5a048ffc318af12e30f70252c93549571e6443d8ed6362eb625d93dcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 5072 bytes
font_01_sfnt_off0000dcd8.bin
2dd657d5b4d5d3471b120c3b4b6a705dffefca38c4cffacc87a32b9b6b4b9473
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 10828 bytes