Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bbb0d3a36064e9…

MALICIOUS

PDF

73.6 KB Created: 2021-02-17 02:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a1eb08ac6ffb512128c964ff656b16de SHA-1: 60fbb2985561e86b4ea00af42938ae45c3b76ff0 SHA-256: 41bbb0d3a36064e94d120deb5df32be469115f7213de1aeeaaf985f7a5d9db66
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/aws?utm_term=duromax+xp12000eh+dual+fuel+portable+generator+for+sale PDF link annotation
    • http://idealica-ufficiale.site/dafopivus5rvzb.pdfIn PDF document text
    • http://dirtygirl.fun/el_moasser_math_1st_secondary_guide_answers3miuo.pdfIn PDF document text
    • http://winnerslm.space/walexememapikulezinudu9nt7c.pdfIn PDF document text
    • http://1xbet-registr.site/cementerio_de_animales_stephen_kingb636j.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/ggFcMQZ/40566781520.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/Vv2sid9/stream_alerts_for_ps4.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/84539896683.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/dHUnpgd/66858580283.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/ifjeOgi/laxerubopipisixil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_601b493520a91.pdfIn PDF document text
    • http://foxiwirilavisan.22web.org/quadratic_equation_word_problems_with_answers.pdfIn PDF document text
    • http://teachost.com/voxalelubizofojejakdcp2.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/hiibogh/roblox_verification_not_working_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/icKgjgi/real_racing_3d_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6019792f3642b.pdfIn PDF document text
    • http://boost-store.net/alameda_alliance_provider_dispute_resolution_request_formkn597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fe2e4c068a37.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/whahahd/22473087850.pdfIn PDF document text
    • http://springwin.space/80523299571nvgyn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_5fd7b687f051a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nulabede.epizy.com/latest_ubuntu_32_bit_free.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/basewutelumajenetu.pdfIn PDF document text
    • http://bofisul.rf.gd/pink_bubbles_images_free.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5988 bytes
SHA-256: 3ef5824935ad750956e8fa653febc5f4ee0786486ce9bf7ad23687fd23e96b90
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 10792 bytes
SHA-256: cd142a9fbbb646b9e5c876726e10ff6017972a2fac34838eb1310c1ad983ba3e

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