Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f844dc8319c3b83…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 08:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a33def3bdcc7412d700f09381433456f SHA-1: 4dbf765693df79d37ec471a5f65eef56a73c963a SHA-256: 6f844dc8319c3b83c44be7fb34fa927658cdf0f7ac869f779dc4928765db9056
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a social engineering lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the PDF and the detected threat suggest it likely exploits a vulnerability or uses embedded content to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ponafet.ru/123?utm_term=chrome++settings+auto+open
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/8580058.pdf
    • http://afracheat6.xyz/16371405363jfo40.pdf
    • http://kzrovk.xyz/brandon_burlsworth_death_photoshoa5g.pdf
    • https://cdn-cms.f-static.net/uploads/4485451/normal_5fe901a3961fb.pdf
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5fe2259fd73c0.pdf
    • https://cdn.sqhk.co/resesexiraf/aaxUPIe/tagavi.pdf
    • https://cdn.sqhk.co/jenotefi/hShdKfe/dumokorabebupepeb.pdf
    • https://tonuwuro.weebly.com/uploads/1/3/0/7/130739505/851065.pdf
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/wijowurixoxime.pdf
    • https://cdn-cms.f-static.net/uploads/4419826/normal_5fd852d129c63.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://sepikiduluwad.weebly.com/uploads/1/3/4/4/134487701/4973142.pdf
    • http://indital.fun/48787759639v1vdj.pdf
    • https://cdn-cms.f-static.net/uploads/4445890/normal_605660716d012.pdf
    • https://cdn.sqhk.co/pefapalotux/fV1iggF/bubble_cloud_levels.pdf
    • http://lifeit.pro/11400347794t62pz.pdf
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/wojoguxovifogog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zenejoku.rf.gd/hiking_merit_badge_requirements.pdf
    • http://resuzebapaluga.rf.gd/alikiba_aje_music.pdf
    • http://zegujirekari.epizy.com/star_trek_enterprise_series_1_episode_19.pdf
    • https://s3.amazonaws.com/wanalovum/dojagusitij.pdf
    • http://wejasemuxo.rf.gd/lukokipubarasagaga.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/96977536882.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_off0000e6e9.bin
f11407c595a6646a29023d2c1f3420d5ea04cc0ce0eaaf35bf57eea6ccf221d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 5108 bytes
font_01_sfnt_off0000f819.bin
e1351a03b392572078fce38f12042989b4e4611f546996d2df3e5b20255586e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 11032 bytes

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