Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcd23eb4bddaf48…

MALICIOUS

PDF

83.2 KB Created: 2021-03-08 03:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ef4bf3627c3bcca999b3286fcdf7eba SHA-1: 5bc1faa209d7aa76fd55c99dc162c2f029d2989c SHA-256: 7dcd23eb4bddaf48097b9da4ad583a2461cc998259189b42baa56780dc706c7a
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URL that leads to a page with a keyword related to 'algebra 1 mid chapter 5 quiz answers', suggesting a phishing or scam attempt. The PDF structure itself is also flagged for duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://fokemale.ru/wix?keyword=algebra+1+mid+chapter+5+quiz+answers
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/2986b7c3.pdf
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5fcb7305e9780.pdf
    • https://cdn-cms.f-static.net/uploads/4489994/normal_60209c9b485b5.pdf
    • http://zobebukore.22web.org/80686624821.pdf
    • https://winilogixibofop.weebly.com/uploads/1/3/1/4/131408061/nipuga.pdf
    • http://chaptejvxz.fun/50608512429h3smp.pdf
    • https://cdn-cms.f-static.net/uploads/4491969/normal_60306238d8586.pdf
    • http://instapriz24.online/ipod_nano_2nd_generation_backlight_not_workingtjbtg.pdf
    • http://koreanluxe.com/wildgame_innovations_xb370_crossbow_partso208j.pdf
    • https://cdn-cms.f-static.net/uploads/4383579/normal_6031590ee1fb4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f21879d-156f-4136-a5e1-5670e14198fd/reradelanuwujujezu.pdf
    • https://s3.amazonaws.com/kakekojezutok/edge_browser_for_windows_10.pdf
    • http://doroxokile.epizy.com/arithmetic_worksheets_grade_5.pdf
    • http://vibofaser.rf.gd/45346892627.pdf
    • https://s3.amazonaws.com/mejigavukolu/1814709125.pdf
    • https://s3.amazonaws.com/voxulija/63087946219.pdf
    • http://tijiwef.epizy.com/tilatuzagi.pdf
    • https://uploads.strikinglycdn.com/files/3172dddf-cd17-4e34-9024-ad3a606cf0bd/sozisetifejugaxetoforufex.pdf
    • https://uploads.strikinglycdn.com/files/0d4240a3-72d0-4c9a-aee7-5d3c9d7f299e/neato_botvac_d_manual.pdf
    • http://buvelijixuzumu.epizy.com/world_war_z_book_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/e8ae98da-e8cd-4b9a-b741-3e78916a91c7/7469850542.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_off00010566.bin
f087fc9f5568dc880d8a5bbe06caa9b9fcb39e6076e98542910409a3ad6dc155
pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 6060 bytes
font_01_sfnt_off000119f1.bin
453508ead64329da1afa46f8f7fda595ce23af8b5cc30045220b7386b84beb1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 10988 bytes