Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cd703fee9a2afc…

MALICIOUS

PDF

62.9 KB Created: 2021-02-16 19:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7a2d44661698b0901aa1b73ade3a2bd3 SHA-1: dfa450df2bf48dc4c811a5f08e42b3be4423291d SHA-256: a8cd703fee9a2afcb813290be150c47d4e45576e4bcc28a2bf55bdc1bc279fdd
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 point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=chicco+lightweight+stroller+rain+cover PDF link annotation
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/kesepiwejixis.pdfIn PDF document text
    • http://bonboxstudio.com/indian_history_books_for_competitive_exams4ktou.pdfIn PDF document text
    • http://samozanyat.info/beechcraft_bonanza_a36_maintenance_manualo0cj6.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/RjijbBi/sadireranajefiburid.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/giM42je/act_mode_navy_field_152_type15_ver2.pdfIn PDF document text
    • http://losmopaka.site/jufukanomupiritamuwf0eyu.pdfIn PDF document text
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/acaaa653c3.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/manurema_lisevisoxop.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/jfhctgf/magoj.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/zoxewudunigus/guruwisud.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/ff14_heavensward_dungeon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/40338220674.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/81207991571.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/16743620312.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/android_wifi_master_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/scrum_master_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/transformation_of_aspirational_districts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/vodale.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/regalos_manualidades_para_mi_novio_faciles.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/girlfriends_guide_to_divorce_season_6_netflix.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_off0000b841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 5120 bytes
SHA-256: 6bc6853b3673b99386e5ae5e65ad17dc638bcda7031525d8b7c8383ac06f9e0e
font_01_sfnt_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 10308 bytes
SHA-256: d8d6be01a807d3147e486a3d09125a4b53eb199db3fa57dccba8951733e9c614

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