Malicious PDF — malware analysis report

Static analysis result for SHA-256 2440cb6481c41d89…

MALICIOUS

PDF

81.3 KB Created: 2021-04-16 23:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e3b255f6e2ae83dfeae3473c126bf1f SHA-1: ea47f7cdc970f58f63090fc6782b5b7c302756ad SHA-256: 2440cb6481c41d89283b77b843db411c447fa107ccc1ed261125a4e184d5f41c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=pentair+intellichlor+ic40+vs+ic60
    • http://dimozakebaba.scienceontheweb.net/gudasurewepometakazaxep.pdf
    • http://lokubakodo.getenjoyment.net/pekuj.pdf
    • http://lowusonuraku.mygamesonline.org/vakilefuwegokuxanes.pdf
    • http://kofojoxake.mygamesonline.org/lawurebabotilejadujivela.pdf
    • http://kijareraja.22web.org/free_accessibility_checker_for_mac.pdf
    • http://kubarabonexomi.iblogger.org/25512006826.pdf
    • http://jukojadijomefar.medianewsonline.com/applied_linguistics_journal_articles.pdf
    • http://fuzuwozozat.mypressonline.com/16985385093.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://benamow.myartsonline.com/what_is_the_military_code_for_letters.pdf
    • http://nupatugo.epizy.com/jejugelal.pdf
    • http://domekitopep.rf.gd/tapurakane.pdf
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_fcdcd6b19ac7482089eeda7baae69229.pdf?index=true
    • https://s3.amazonaws.com/muvazi/wd_tv_media_player_specs.pdf
    • http://lojepizalek.rf.gd/android_9._0_pie_phones.pdf
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_bb7ef69817b44688a77e2b7e5dc4ca0d.pdf?index=true
    • https://s3.amazonaws.com/vonusirukete/betpawa_nigeria_app.pdf
    • https://s3.amazonaws.com/semuxemakaw/sarah_plain_and_tall_movie_watch_online.pdf
    • http://madanekobovuge.epizy.com/goxofin.pdf
    • https://s3.amazonaws.com/rujabepifar/42393539564.pdf
    • http://kejagabato.myartsonline.com/48416160545.pdf
    • http://delozaroj.epizy.com/41998198016.pdf
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_7b7327c35d8e4ee09c77f0e9020b9f31.pdf?index=true
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_c52f67ae2bd0456e8789619bd26d6550.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/sandisk_8gb_clip_jam_mp3_player_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a8.bin
21b7b3ecc55cbfe3400a07d8feddf1928b1edefb31018e372d3536e04a3d4b60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 5120 bytes
font_01_sfnt_off000101fc.bin
64d65f837c960abe3e550ad6ab22325cb3c1d2becd93178c463c217d2c936c29
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 11568 bytes
font_02_sfnt_off0001297b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 4324 bytes