Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9361c90914e83c…

MALICIOUS

PDF

88.9 KB Created: 2021-03-19 12:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf19ad36bba71d7e94edfdde2d70a847 SHA-1: ed4a7ee83bf65c5be80de59f2a58c6cbb56bac0e SHA-256: 8e9361c90914e83c3dcc1cb0548dbae3bfed71c4dc253813997ff110599e0585
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, containing numerous external URLs. ClamAV and ML classifiers identified it as malicious, specifically a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://resalured.ru/wix?keyword=stanley+model+tre650+manual
    • https://cdn.sqhk.co/dagozuwemep/Wkx3Ihi/supirigiweb.pdf
    • https://cdn.sqhk.co/ruxagoxoman/i9ghebO/ccleaner_apk_for_android.pdf
    • http://fosiwox.22web.org/genoni.pdf
    • http://pizimiwubavip.iblogger.org/46125563583.pdf
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/9491683.pdf
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/5ba3bb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8af84ee4-7cd9-4220-9752-664858dbc914/5247936530.pdf
    • http://tewamenuve.rf.gd/android_auto_google_play.pdf
    • https://s3.amazonaws.com/jifesu/graphic_design_bangla_tutorial_free.pdf
    • https://s3.amazonaws.com/kakef/sepivirosan.pdf
    • http://wajodojizofe.epizy.com/9347467481.pdf
    • https://s3.amazonaws.com/xenavuxa/wynk_music_telugu_app.pdf
    • https://s3.amazonaws.com/waxapoz/12228955240.pdf
    • https://uploads.strikinglycdn.com/files/9b3672a1-a90b-4569-82aa-1b31561378ac/80918205942.pdf
    • https://s3.amazonaws.com/bisapovepizaj/50311077192.pdf
    • https://s3.amazonaws.com/rujimidujek/free_powerpoint_presentation_templates_for_history.pdf
    • https://uploads.strikinglycdn.com/files/6d147630-a874-4889-a598-31a97856c90e/27915791163.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e83.bin
5c26a6e4f0573cd267e1d304097b714105ce668633c71da09722a3ccbabe60ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 5252 bytes
font_01_sfnt_off0001203e.bin
48b5a277026dedf70515afd2e9b0bb5cff83b6b74556f256b771417c66993a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 12552 bytes
font_02_sfnt_off000148b3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B3 4324 bytes