Malicious PDF — malware analysis report

Static analysis result for SHA-256 d436216e934a24fc…

MALICIOUS

PDF

81.7 KB Created: 2021-03-27 10:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1ed9a88419651be60e1cae93b4326d24 SHA-1: a8c2be67942f352ab4b284e76cdb7e44b242c960 SHA-256: d436216e934a24fcb03436d3429f6d06528acb1d7dc5a98fb65c756f1994e0e4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'xajibur.ru/award?keyword=cathode+ray+tube+tv+pdf', suggesting a link farm or SEO spam tactic. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards malicious intent, likely involving the exploitation of PDF viewers or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/award?keyword=cathode+ray+tube+tv+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480594/normal_6008f07f74b2a.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jhSjgge/memosiperefepopiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fed4a384b588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_60510aea3164b.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/QhiheyA/bulk_sms_pro_business_marketing_tools_list.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/tjjggZh/lapejakuwelejuvagalepilow.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/gxdibji/17106159157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5fde5ec1cb1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/ghhhMgg/throw_it_down_take_a_sip.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/2bjbjco/7349105042.pdfIn PDF document text
    • https://cdn.sqhk.co/gajalalike/c7ijmEY/adobe_creative_suite_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5fc6ce1320ae3.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/xeroguru/royal_1200x_paper_shredder_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/call_of_duty_modern_warfare_2019_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/92641650340.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/desh_bhakti_dj_song_new.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/vakatamusidis.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/camera_translator_apk_mod.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_65ff1c5a7847407e98db57d49152b6f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/star_chart_app_android_free.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_e23519714aa94806ae17005a8cde61fc.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_f1b95a4f9f0d47d395e3fe134ee36733.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_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 5128 bytes
SHA-256: 8846bba47cd70f7a26d12df71b43de633a3d5333ba4df46a922fee5cc3573ea9
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 11484 bytes
SHA-256: 63ff9862d91c5bc49c2a6ac850930b83fc8294ec040e0268cb17863cebb4c26d

Open this report in the interactive analyzer, or submit your own file for analysis.