Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36caa81e4eb6a35…

MALICIOUS

PDF

98.3 KB Created: 2021-02-17 09:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae5e971c7318548fe12b204ddebe9ef9 SHA-1: a13ee186d51158880824c5cf2c272dab32d75f98 SHA-256: d36caa81e4eb6a35b0964953f343c1ec9bbcb08a56e97ba7e650beefe7e4657c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a tactic to obscure the final malicious destination. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing or malicious redirection attack.

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 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://druttle.ru/wix?keyword=thor+ragnarok+google+docs+english PDF link annotation
    • http://wineninuxusafu.22web.org/78121315537.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/4665891.pdfIn PDF document text
    • https://zodurulamenuvud.weebly.com/uploads/1/3/5/9/135956643/jarevafomuwolirimax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fd1c3fb31d6d.pdfIn PDF document text
    • http://sale50.pro/coulombic_attraction_packet_answer_keyiqc8j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5fd0bac730025.pdfIn PDF document text
    • http://jushq.club/bug_s_life_full_movie_free8xz40.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/fgvGihy/dj_record_scratch_sound_effect_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450727/normal_5ff2662684887.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/hbgghbK/pulufakituvaba.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wolalupalorawe-nukexumuxosowox-nomonomuviralu-kilusivi.pdfIn PDF document text
    • http://lishop.site/208057030023878x.pdfIn PDF document text
    • https://mikudope.weebly.com/uploads/1/3/5/3/135305195/9495841.pdfIn PDF document text
    • https://fanamixaxa.weebly.com/uploads/1/3/4/0/134017579/806e980cee55ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/jdhhgev/netflix_stock_drop_cuties.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutegug.epizy.com/85543907510.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/glencore_international_plc_annual_report_2012.pdfIn PDF document text
    • http://momedeturus.epizy.com/brother_of_the_year_eng_sub.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_off00014295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 5212 bytes
SHA-256: 722be6210d6af5792be3e0ac70148ab593d687bbda5a1209b3a8e5730eed2524
font_01_sfnt_off00015449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15449 11296 bytes
SHA-256: 27036169d79f6eaa0197aaabff2805d41e2fdce1ba07c97734b6e07791a8176d

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