Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51932ba8dcb02f7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-02 23:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55ecbea00728d8408d6b7ba514ebbb40 SHA-1: b5045393448ecc5dd86cd86ff0d35cfb4479c184 SHA-256: e51932ba8dcb02f74dfe6b7fc9ffb91089a4bae5fedcd4992851231a4890c67f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://jacksth.ru/strik?utm_term=what+to+drink+with+green+apple+crown+royal PDF link annotation
    • http://nugekurobeju.iblogger.org/affidavit_template_form.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/93710613590.pdfIn PDF document text
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/1888741.pdfIn PDF document text
    • http://disconto50.pro/jarajd0rkl.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/easytouch_indoor_control_panel_no_comm.pdfIn PDF document text
    • http://hangzhoumetal.ru/all_tenses_exercises_with_answerspoeto.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_connect_to_a_polaroid_bluetooth_speaker.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/7d9da40336a829.pdfIn PDF document text
    • http://prizinsta365.online/mr_coffee_iced_tea_maker_3_qt_instructionsku7x1.pdfIn PDF document text
    • http://legalvictory.group/sprint_car_racing_in_australia6j0op.pdfIn PDF document text
    • http://losiruwu.66ghz.com/dexanajepa.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/jio_mobile_video_calling_baat_karne_wala_apps.pdfIn PDF document text
    • http://allwoman.site/free_lodger_agreement_template_word60q2o.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/city_news_weather_reportersalpqp.pdfIn PDF document text
    • http://namekegosanobus.22web.org/fupebakamulilorenewaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojikigor.myartsonline.com/23332325934.pdfIn PDF document text
    • http://domojemaki.rf.gd/ariens_8524_snowblower_oil_change.pdfIn PDF document text
    • http://taxivufiwe.rf.gd/how_to_write_a_summary_of_a_textbook_chapter.pdfIn PDF document text
    • http://pepebejawu.epizy.com/tubelanobobevazamepazam.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/egyptian_cotton_sheets_cairo.pdfIn PDF document text
    • http://xenituv.rf.gd/84887338061.pdfIn PDF document text
    • http://nisarinu.epizy.com/binujubuvuvuraget.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_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 5428 bytes
SHA-256: dd3b6accbc6ed282d553752c22a4e52c2eca33dc127774516800e9825d2115bf
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10960 bytes
SHA-256: 7e786ed01f9de1de78134b5de40b4f7305a04309fce2acedf72e3ec2f19ada1f

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