Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44273f9d1473efe…

MALICIOUS

PDF

68.4 KB Created: 2021-04-08 19:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a510272395505761cab793f31aaa888 SHA-1: ec43cc850006c8ac4b70c1cf37f4574c8d1120ff SHA-256: d44273f9d1473efe413b45605ab6f5cb80e6e29de8c5f053699198b4fc5f92e8
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to a malicious URL. The presence of numerous links to disposable hosting and link farms indicates a coordinated effort to distribute malicious content.

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://midufefew.ru/strik?utm_term=casio+2688+gw-500a+battery PDF link annotation
    • http://netekepipavosis.sportsontheweb.net/sejarah_agama_hindu.pdfIn PDF document text
    • http://ceter.xyz/xewezuj28w1e.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/cviPieU/super_dino_run_power_race_3ds.pdfIn PDF document text
    • http://graatorama.space/ciudad_de_papel_resumen_libro4vica.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/fgfN9Du/relufazobevuxojojejugupex.pdfIn PDF document text
    • http://kidepokapila.22web.org/jaguvorijekuroxurinu.pdfIn PDF document text
    • http://prechambre.xyz/847604909032zwq7.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/RojjbkD/zuxoburatimo.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/cover_letter_for_job_application.pdfIn PDF document text
    • http://delinapod.mypressonline.com/93870423078.pdfIn PDF document text
    • http://sosed.market/mr_coffee_cafe_barista_customer_service7hogt.pdfIn PDF document text
    • http://rubisteq.online/rival_stars_college_football_tipssvfyp.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/bARssv1/senior_women_s_national_football_championship_2018.pdfIn PDF document text
    • http://navaram.online/9.3_rectangle_rhombus_and_square_worksheetu2pts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekabugi.epizy.com/dell_b1160w_ppd.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_81e04e8d966c4086a23ebc8ee995f69c.pdf?index=trueIn PDF document text
    • http://lasakarafivof.epizy.com/fabotolarorefuzadav.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_3e4a520790c64161af10aa63d6691995.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_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 5840 bytes
SHA-256: 552b549c55443f4c8ac3a48d8714bd3d3c084cc1e4ff4347393007c508f55b6c
font_01_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 10532 bytes
SHA-256: 7336cf6ed1923a09f6ed75ea9ae22ee7a6c02d30c55b55dc6caeb70bd6137fb9

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