Malicious PDF — malware analysis report

Static analysis result for SHA-256 388cc2dd630bb3ac…

MALICIOUS

PDF

86.2 KB Created: 2021-03-24 10:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 497e4e1bea5b07024c90f2201dc9086f SHA-1: a24bd5acfcb8e6293792830223d92fc804bfccfb SHA-256: 388cc2dd630bb3ac6d7851b92452da1f9c8831b0bd1a46432e98986eafad3901
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing numerous external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/123?utm_term=worksheet+generator+for+teachers PDF link annotation
    • http://pofaduxiruk.getenjoyment.net/zukiluvetelepororof.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/zEgjQgd/download_game_vr_roller_coaster_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/iege7ib/exam_stress_management_tips_for_students.pdfIn PDF document text
    • https://naboparukoxe.weebly.com/uploads/1/3/3/9/133997388/4670221.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/dg8ifhj/topiridotuwodovik.pdfIn PDF document text
    • http://dunatizikasinab.22web.org/kabarawaguri.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/NigOrif/descargar_fast_save_for_instagram_apk.pdfIn PDF document text
    • https://xaduregenotilok.weebly.com/uploads/1/3/4/7/134711203/jinonadala.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/31e2953fa78266.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/h8ien7A/96495572419.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/acWr4re/aliexpress_usa_clothing.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gjghN7v/best_box_game_ps4_2018.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/datijuzig.pdfIn PDF document text
    • https://fazinetogoxuv.weebly.com/uploads/1/3/5/3/135383047/a82fe1ae1.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/jeicOhd/79010617237.pdfIn PDF document text
    • http://gunisone.iblogger.org/63877457392.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/bjdq9hi/best_modern_sculpture_artists.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/66670920631.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/nufidibodudulad/best_online_adventure_games_apk.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/how_strong_is_1095_steel.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/simplifying_exponential_expressions_worksheet_answers.pdfIn PDF document text
    • http://nozixexegaliwe.rf.gd/grammarway_4_with_answers.pdfIn PDF document text
    • http://texaliborobiko.epizy.com/41807749662.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/zimukuzatulikuse.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 5188 bytes
SHA-256: 4978ba23de7a95be8f47e93c87ce0c8373b6be28ef9c2de6fc1edd8aea2db072
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 11184 bytes
SHA-256: e244c57b1f2daa4fca5adece9d7abf1ca3a4de9d40cdd70625b1c6429c3d9359
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15