Malicious PDF — malware analysis report

Static analysis result for SHA-256 43830cf301a8a8f0…

MALICIOUS

PDF

76.5 KB Created: 2021-03-06 17:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04dcf1820c05cacb6e6d0533c7598753 SHA-1: ce712882ea88b5e64c80a7e8f1165e978c31f886 SHA-256: 43830cf301a8a8f00fa41d7a18e34e9565eb30c010dd32e5bdbe8096b6b3eeab
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 hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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/wb?keyword=10%20interesting%20facts%20about%20langston%20hughes PDF link annotation
    • http://wejaduz.mypressonline.com/book_report_activities_for_high_school.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/1849985.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/jemuruxape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_5fda5dadda477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fe047c465fb4.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/kusimavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_6038d0e82c69b.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jhdjafd/bogotet.pdfIn PDF document text
    • https://gojamomer.weebly.com/uploads/1/3/2/8/132815882/9548775.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/4ifjdO3/helicopter_crash_nyc_twitter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fd79f8801aff.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/rHS56jf/starbucks_fall_menu_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/eklaUWN/64399208534.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/poseemos_2_tipos_de_comunicacin_verbal.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/5367386.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/Vkjijjc/ranger_vs_zombies_mod_apk_unlimited_money.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/wirarexowe_xagagis_bajenivewus_fedejitaze.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/what_happens_at_the_end_of_death_cure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5ffff94f95077.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/25664233031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numotuvafoja.epizy.com/larimenafarimagipa.pdfIn PDF document text
    • http://jajuzefob.rf.gd/81554016627.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_1f00bb23a5ae47a1965bf5360428f895.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_f1eba3b69d17439f877d06c507b07917.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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 5384 bytes
SHA-256: 5443fb8c3367f8c64b5668aa13e1f303cb6d0d0400ddce894778e61fb563a6c0
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 10088 bytes
SHA-256: a8dee935613ed206ffa0a1232d8c3f44fe7f282238faadc3ab577e882d0492ff

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