Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6a4cd274576979…

MALICIOUS

PDF

79.7 KB Created: 2021-04-03 02:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0806dca7c6cd9d38c3f818204ee31ac4 SHA-1: 9ce6d406b75fd0845b451a2b0c940f3314c87795 SHA-256: ba6a4cd27457697942ac51ca4efa42bb62b974caefe62af98b3ee96c94fe3c30
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, with one prominent URL pointing to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a campus map, likely to trick users into downloading a payload.

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://midufefew.ru/award?keyword=university+of+central+florida+campus+map+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457312/normal_6023d74ad70a8.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/36111126577.pdfIn PDF document text
    • http://static-get.top/claw_machine_arcade_near_me5g1s4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff94bc1b36e6.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/ascending_and_descending_order_worksheets_for_grade_1.pdfIn PDF document text
    • http://lojasamericanasbr.com/ipad_mini_5_case_with_keyboard_and_pencil_holderr9shu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600dd1802e2f8.pdfIn PDF document text
    • http://akvatehnika74.ru/learn_spanish_language_free_downloadg5pqb.pdfIn PDF document text
    • http://operationhomeplate.com/colors_and_clothes_esl_worksheetz36wu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_60173e869655b.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/internet_advertising_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafebevu.rf.gd/vebajojalo.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_6eddbc35918e43bf92d43c44e43f7201.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_9d4a0c1fa2d149fbaed58633b42587bd.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_8f5d239aab1c4a98958a45db69878214.pdf?index=trueIn PDF document text
    • http://napusikut.epizy.com/academic_writing_style_guide_uk.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/gerozujekabojoxejokenipo.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/74014085806.pdfIn PDF document text
    • http://kegaregajisojas.rf.gd/vpn_android_free.pdfIn PDF document text
    • http://rulixazani.rf.gd/5455621361.pdfIn PDF document text
    • http://tumaxokalabad.epizy.com/when_do_hillsborough_county_schools_get_report_cards.pdfIn PDF document text
    • http://pijularof.epizy.com/88376216882.pdfIn PDF document text
    • http://vugugevijoxudi.rf.gd/business_process_improvement_plan_template.pdfIn PDF document text
    • http://dukuzuwikisos.epizy.com/marathi_barakhadi_letters.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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 5452 bytes
SHA-256: 8ef3c8165ad0fbb68f61548edd6184267fa5b59678fa89dabd2c03b6107e3bfa
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11344 bytes
SHA-256: 3d35145b948365d1f3a390c7710fc0b11b1e8b7cda7e31dfa092f01d9a48ff00

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