Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b79f572714698f…

MALICIOUS

PDF

77.7 KB Created: 2021-03-03 15:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f92136957834adcb8184e4edc10b0597 SHA-1: 0793720692e44fe5bafdd1b0046db9f98fe2a689 SHA-256: 02b79f572714698fc62a61d64cee8770a72b543b073ece8dee62c93209daac8d
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to contain keywords related to arrest records, likely a lure to attract users to click on the malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=st+landry+parish+daily+arrests+november+2019 PDF link annotation
    • https://cdn.sqhk.co/nomitusibop/jdggFhh/warunerekarib.pdfIn PDF document text
    • http://sekuweb.iblogger.org/23307067167.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/hihQz4Y/tuniwaxet.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/biblia_de_estudio_vida_plena_reina_valera_1960_gratis.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/kuzapodigagijapobexave.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/COwhJia/pc_build_simulator_full_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/jbAgdje/traffic_racer_hack_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivubijorudi.epizy.com/taxodaruwubom.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/example_of_banquet_event_order_form.pdfIn PDF document text
    • http://gigapexolazet.rf.gd/asus_eeebook_x205ta_bios_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/bottomsheetdialogfragment_rounded_corners.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/kaxof.pdfIn PDF document text
    • http://govuwetubor.epizy.com/lagu_iwan_feat_amelina_yang_tersayang.pdfIn PDF document text
    • http://jeragapa.epizy.com/antenna_theory_tutorialspoint.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/34097966993.pdfIn PDF document text
    • http://kovudefimure.rf.gd/xuxukidubis.pdfIn PDF document text
    • http://xafamikipu.epizy.com/dosakezezi.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/depotur.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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 6084 bytes
SHA-256: f9147211f2742c3bd6e66c28ab4356743ece6358e8c511799d521a621cfa5de4
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10612 bytes
SHA-256: 7d7f4fdb03369314f0b5f2fa2433eec1067bcdcc116324816ea0e0ea2dc95660

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