Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e79d06aa5f7ff9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 07:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f22ad8bdd72428fd21a8808a3b506b44 SHA-1: d81b4e0a1ddc4abe01e7bd7c46820d0f73a88fa7 SHA-256: f3e79d06aa5f7ff95dff7bdfde0d62185b41aba8ef898a13332e49a8f10ae0f8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('resalured.ru') that is likely used for phishing or malware distribution. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=electric+pressure+cooker+corned+beef+cooking+time PDF link annotation
    • http://wwnews.site/fox_engine_downloadbij2p.pdfIn PDF document text
    • http://idealicaitalia-official.site/que_pasa_si_tu_media_naranja_es_toronjaauma0.pdfIn PDF document text
    • http://mynasert.online/50404652132zr77v.pdfIn PDF document text
    • http://am-sound.ru/depexezudesipasejodif84f9x.pdfIn PDF document text
    • http://presente-top.store/80839447082m2lwf.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/wihf7KW/37781883383.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/5ggGnjj/31354682961.pdfIn PDF document text
    • http://feelslike35.com/bakolopepefedigukofiva9gzxz.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/A14jjBe/wallpapers_for_among_us_fandom.pdfIn PDF document text
    • http://vuxiparami.22web.org/systems_engineering_and_analysis_benjamin_s_blanchard.pdfIn PDF document text
    • http://vezerfa.xyz/monimegazunesugogaxoragewjzw3h.pdfIn PDF document text
    • http://eurostore.info/como_fazer_um_resumo_trabalho_academicopwb94.pdfIn PDF document text
    • http://leree4.club/homework_pass_templatewwlu3.pdfIn PDF document text
    • http://topmassage.net/17169602436m1gty.pdfIn PDF document text
    • http://islta.fun/bushnell_tour_v3_batteryzg7c4.pdfIn PDF document text
    • http://opensoda.pro/35156467807w6l4g.pdfIn PDF document text
    • http://cabinetshub.xyz/naporazososexezatizemiar65.pdfIn PDF document text
    • http://jilet2.club/72073764759dmza0.pdfIn PDF document text
    • http://boomerangoo.site/calories_in_boston_market_chicken_breastgfpzf.pdfIn PDF document text
    • http://takavejesutep.iblogger.org/kusaroku.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/risisipajole/93209300502.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/android_screen_capture_without_power_button.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/64663713576.pdfIn PDF document text
    • http://dumatefofexulen.epizy.com/listening_and_speaking_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/traduo_guidelines_em_ingles.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5424 bytes
SHA-256: 173100a3b6936434d75a3a047ab3cfecb1dc7a53df69dd3f0774a98b5a83a1bb
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11192 bytes
SHA-256: 9de06638c632e835c455d4ac671508e35fa56ff887496ae83c982abd972695e3

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