Malicious PDF — malware analysis report

Static analysis result for SHA-256 622d83b43cccde29…

MALICIOUS

PDF

77.6 KB Created: 2021-05-07 18:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2369e1e003b75df7786f0a8fc227e2f1 SHA-1: ea5e8bf1f7dfa5a1ea12e20ff1cd9f482a2c1068 SHA-256: 622d83b43cccde293540c70957e0c4f56dd7555bc46f09b52ceac1977ef27740
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains and are likely part of a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=letra+del+toque+de+bandera+mexicano
    • https://cdn.sqhk.co/wovedajuraki/XWXbcWr/microsoft_teams_for_mac_current_version.pdf
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/rivuxisetajez.pdf
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fc82dc9cd648.pdf
    • https://cdn.sqhk.co/tabewinudeka/Sjhjjiy/paderenibinepid.pdf
    • https://razovifizekojo.weebly.com/uploads/1/3/4/4/134439397/varalupijo_pevin_gebopuxemekobop.pdf
    • http://pigozolifafaw.iblogger.org/32959956770.pdf
    • https://cdn-cms.f-static.net/uploads/4422377/normal_605b1ca015bbf.pdf
    • https://cdn-cms.f-static.net/uploads/4369313/normal_60368f4cf31b4.pdf
    • https://cdn.sqhk.co/venifirub/PhbcjhS/move_app_to_sd_card_apk_root.pdf
    • http://vonilopume.22web.org/32330907478.pdf
    • https://cdn-cms.f-static.net/uploads/4427284/normal_606736522a10c.pdf
    • https://cdn.sqhk.co/mafowixodi/DpQyihH/26856279227.pdf
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/padimut_rupubevasimepew_wakikalidazetev.pdf
    • https://cdn-cms.f-static.net/uploads/4506131/normal_603092925cc86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zonivezada/nibiwasolagijafo.pdf
    • https://s3.amazonaws.com/kujapomib/auditor_general_report_2014_ghana.pdf
    • https://s3.amazonaws.com/gujutavevive/shazam_vs_soundhound_android_app.pdf
    • https://s3.amazonaws.com/gagotaniwipure/skip_the_dishes_courier_app_android.pdf
    • https://s3.amazonaws.com/fajonubinomeder/string._format_double_two_decimals_c.pdf
    • http://gizugutopaf.epizy.com/39985258978.pdf
    • https://s3.amazonaws.com/jenisozazewubo/word_order_exercises_intermediate.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/yowhatsapp_apkpure_terbaru.pdf
    • https://s3.amazonaws.com/povodijirig/android_pass_callback_method.pdf
    • http://tudalumovadir.epizy.com/multi_storey_building_elevation_designs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd3.bin
2cce66d4f035d6cbd9c10e5600df436f3f408e4706cb12e612d1eca556d93930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 5180 bytes
font_01_sfnt_off0000fe5f.bin
d6ba588d910a696012d40a0dd20621fc70b2b25e56812f438c6127cb6f428b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 12536 bytes

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