Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb50a93f90a4fdc…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 01:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 390b043fe8ba2b9a1212597ed5c6cd42 SHA-1: f72385cf3af727b0208648e6917896c27dea99ea SHA-256: 6fb50a93f90a4fdc0965311066ecb5e9e5a0223de61241b8fb10870e2103265a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=idp+ielts+reading+answer+sheet+pdf PDF link annotation
    • https://cdn.sqhk.co/luwibajik/whhigdy/tool_kit_lowest_price.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/ie5HZji/94246952690.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/aojbtjj/cooking_fever_hack_gems_and_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/lokatatape/rhdjhTh/41442235686.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/83198082095.pdfIn PDF document text
    • http://xomapometafa.iblogger.org/play_store_kaise_kare_jio_me.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/5jioEgj/nhl_general_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/Pihjdif/download_game_eternity_warriors_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/hejgjuO/28797448653.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/zidoxeverumenedamivuzim.pdfIn PDF document text
    • http://nezolalapiwok.22web.org/devi_purana_in_kannada_language.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/87229b2ac9.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/galora-xufimadakalul.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/dhkbgdV/vojimumasas.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/dgegfjc/load_wallet_smart_paymaya.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/sogutaviboronodowed.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/eFjcTig/last_day_on_earth_survival_game_loop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ramejepazino.rf.gd/how_to_reset_keurig_descale.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_a6f7527053ff46a6a55cc74858978a61.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_3865788c6b2140a597d66381e3558d74.pdf?index=trueIn 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 5332 bytes
SHA-256: d9b572fb3118357c2469e81e4c13a3f18dfad6201d42f4b7b6606f77202d18dd
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 22488 bytes
SHA-256: 190c89730a54c9de6f3c5aa364278d64d360249c96555904b9e24d5f9865ea38

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