Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cbdcff2df40d45…

MALICIOUS

PDF

92.2 KB Created: 2021-03-04 12:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f8869e3fcdda82ff207f0b3e8f1037b SHA-1: ee065138d0cd56dae007bf57daaab504158700f5 SHA-256: b1cbdcff2df40d45cc1bbebbdf5ef052f44e266aeec5455351ed198e6282a92f
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 numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to malicious content. The presence of external URI indicators and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=paige+vanzant+next+fight+ufc PDF link annotation
    • https://cdn.sqhk.co/tumozaraf/jiOEjfL/mizotapabo.pdfIn PDF document text
    • http://it50disconto.info/rafegofonanivosugexow651p.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/9Yiegfb/jakutususulaxaxamawumib.pdfIn PDF document text
    • http://mbfsopg.com/dedofagetizikuguc9z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_602574e95ec73.pdfIn PDF document text
    • http://idslim-italia.site/ap_biology_exam_sample_questionswl64d.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/b28ac78e3d24103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fccbc73a19f5.pdfIn PDF document text
    • http://tosety.xyz/how_does_the_bible_define_courageidxlk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369936/normal_5fca3c7675ecd.pdfIn PDF document text
    • http://lovewaits.ru/in_a_raisin_in_the_sun_what_does_beneathas_hair_symbolizenvqjv.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/in2EDjg/world_war_iii_black_gold_serial_number.pdfIn PDF document text
    • http://homebig.space/lamborghini_huracan_manualrhm4r.pdfIn PDF document text
    • http://zvezdasevera.online/hid_bulbs_replacement_guidemvq2s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446489/normal_5fdf382022d17.pdfIn PDF document text
    • http://dfds.in/joronobapa68c9.pdfIn PDF document text
    • http://moreprodukti.com/devugoxerewuputunagdyiqc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/dxcWiam/90s_pop_stars_female_costumes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nawevuf.epizy.com/88272252861.pdfIn PDF document text
    • http://wexugemo.epizy.com/abcd_2_movie_3gp_video.pdfIn PDF document text
    • http://jowuwivipi.rf.gd/excel_dashboard_examples_and_template_files.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 4788 bytes
SHA-256: 1744e00142389bc9981d4a25d9f1576e12fc5232ae1259ff698d948129e9e501
font_01_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 11844 bytes
SHA-256: 727ada289e1e1106d9a366a92b8ba66d01a2744860058a36bb53854ca6e57c63
font_02_sfnt_off00015539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15539 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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