Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7d6cb6a94dc28b…

MALICIOUS

PDF

73.3 KB Created: 2021-03-18 06:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c03905af28f364f034332b87d5455b7b SHA-1: dd8ed13d310941a865377d5a879003e98fdda786 SHA-256: 2f7d6cb6a94dc28b086c9b385ffc164bdafc81b362486e58568e5ee453da67c4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many links suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=ap+biology+reading+guide+chapter+47+animal+development+answers In PDF document text
    • https://cdn.sqhk.co/xuxibila/jNjfXoq/25008396285.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/WGBghcv/notepad_online_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_601b7b1ead3eb.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/uIgh2gd/6033029648.pdfIn PDF document text
    • http://clubstore.info/what_does_the_quran_say_about_love_before_marriage1ms3m.pdfIn PDF document text
    • http://tuvexiwegivuke.iblogger.org/18827428072.pdfIn PDF document text
    • http://kmplitka.shop/tirinuzadizemuvidimilewowpw2d.pdfIn PDF document text
    • http://nat-yoga.space/3379063203j2e5x.pdfIn PDF document text
    • http://triple-doska1.club/free_bill_of_sale_template_for_carw85ki.pdfIn PDF document text
    • http://websporizle3.com/the_raven_summary_of_each_stanzaa6olw.pdfIn PDF document text
    • http://all-gopro.com/morekzss24.pdfIn PDF document text
    • http://tevfikyuce.xyz/alessandro_barbero_caporettoa72va.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_601cd357e848b.pdfIn PDF document text
    • http://raffle.website/sound_blaster_evo_zxr_manuals39va.pdfIn PDF document text
    • http://firstflirts.site/707056180324nhvi.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://satuzolo.epizy.com/fairfax_virginia_weather_report.pdfIn PDF document text
    • http://wajufuful.rf.gd/javascript_online_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/84306284685.pdfIn PDF document text
    • http://walexesanub.rf.gd/80402685215.pdfIn PDF document text
    • http://xekujigifur.epizy.com/moburafejekefewipiw.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/joreni.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 5920 bytes
SHA-256: a5ed6391961981238f49ff3b2449a23f7d203c5f241c2bc2733e8e010d2940be
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10440 bytes
SHA-256: 0ab7c06ec32eafdfe69433820b1d972d9a8fed8e680f06cff14619462a85846e
font_02_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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