Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb760d3923630ee5…

MALICIOUS

PDF

66.9 KB Created: 2020-12-14 14:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e45aba268db85c1afbb8977f5c12992 SHA-1: 54c3b7dbac8cfd7a622a7f1b5ee0a9bcec62b3c1 SHA-256: fb760d3923630ee57235fa805d2d0c6aa2334802e56f1274c4a38024414bd1cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URLs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=internship+acceptance+letter+sample
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5fad7587bd8c1.pdf
    • https://pamemigewoguvo.weebly.com/uploads/1/3/4/4/134438925/3996160.pdf
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/d2982.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdf
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/e0c5177796a407.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/349752e83.pdf
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/5808739.pdf
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/04dda2a5ff8eb.pdf
    • https://xijanejomasug.weebly.com/uploads/1/3/4/5/134506458/riluketave-zevukejafagivox-jegesidikaz-salofijexu.pdf
    • https://kisupumusu.weebly.com/uploads/1/3/4/5/134513531/9391003.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jakujakula/wimirebimogiso.pdf
    • https://s3.amazonaws.com/waxapoz/bithiri_sathi_video_song.pdf
    • https://static1.squarespace.com/static/5fc178a7ea4a794d56491e65/t/5fccd3422bc7884852b34cb6/1607258947402/realmcraft_with_skins_export_to_minecraft_download_pc.pdf
    • https://s3.amazonaws.com/luxelula/durga_temple_aihole.pdf
    • https://s3.amazonaws.com/dugibabafod/bresser_nv_5x50_digital_night_vision_manual.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_off0000ca22.bin
fa038f5d0bd3c0c549232ced36805837d2c95623f2d36c30d2adc2d43477d060
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 5112 bytes
font_01_sfnt_off0000db58.bin
fbcdf347e73b6c4417c3bb92f8684bfca33885c260b399f81679a983b2168dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10400 bytes