Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e5c2423613f150…

MALICIOUS

PDF

82.1 KB Created: 2021-03-16 00:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ea55a525465f640ebbe9308b67e73d3c SHA-1: 14b1c542f95b1ac8b9e71e91a0452025b3e4ce0d SHA-256: 73e5c2423613f150b2ef45195255a4ff9c2d9c01fe9b29bc9139d6cd8245bc40
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further malicious content. No scripts were extracted, but the presence of many external URIs points towards an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/award?keyword=rango+de+movimiento+articular+pdf PDF link annotation
    • https://cdn.sqhk.co/lewonuvaxu/whfifji/soda_dungeon_2_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/DjcSLN1/jeretowebowubufinewi.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/captain_marvel_comic_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/XjfYphf/guxovorejixidezo.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/ichg929/71118107706.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/fuzebakasapiwidovofajomi.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/geehhjA/jasadujesi.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/ohiXxjd/clash_of_mythos_hile_apk.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/gafufigififonijaruzowi.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/x5hgeha/jejepomunugipalek.pdfIn PDF document text
    • http://joruzutababu.22web.org/kuxenesedosadipom.pdfIn PDF document text
    • http://bosuxezaxad.mypressonline.com/larumivapuwedibabenilix.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/Phhujif/horror_wallpapers_1920x1080.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/0igijj6/50765579407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupoti/tv_serial_app_name.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/veganogij.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/whatsapp_for_mac_os_x_10._7.pdfIn PDF document text
    • http://letelexedat.epizy.com/39396222978.pdfIn PDF document text
    • http://nazifaba.rf.gd/proxy_vote_form_wandsworth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc90a50-23a7-4874-af7c-7a194cc51218/mad_libs_books_a_million.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62f368c-b851-44ca-89db-9aea208de061/how_to_install_a_onn_tv_wall_mount.pdfIn PDF document text
    • http://bidetorula.rf.gd/poseworamofisajigapitok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae7ad7c-32d0-4cf6-a332-657c203d4d6d/delta_36-725_fence_upgrade.pdfIn PDF document text
    • http://kudogal.rf.gd/free_sales_aptitude_test_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f61f2e-54c4-4015-9198-52a37ae22b83/functional_fitness_exercises.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 5364 bytes
SHA-256: 323ff760d25b67e3ab9bdd569715d63488163b218f293a72a5ac1f6f4fc74503
font_01_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 11452 bytes
SHA-256: 08ea9bd5c43831bce8662ca35be17b061cf1486b8463bfed1819681500694211

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