Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cb6e70395d03cf…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 13:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87c9d17e0119e0f7a341cd75d20bc2f7 SHA-1: cee30399f1f7b22fca7be6227bd430309934b15c SHA-256: e3cb6e70395d03cf3482a0382e42141d924868628358b2b4c57729918ffe4c35
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a 'running club', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=tri+state+running+club PDF link annotation
    • http://beststudent.space/ultimate_fall_champs_avoid_the_bumpsn4kcf.pdfIn PDF document text
    • https://netiwililisal.weebly.com/uploads/1/3/5/3/135398280/605928.pdfIn PDF document text
    • http://mofopafilubo.22web.org/honor_buddy_stores.pdfIn PDF document text
    • http://trylait.pro/lolepemakoxedojqqz9.pdfIn PDF document text
    • http://rewita.fun/augusto_cury_downloadb0xto.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/99166806462.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/bubafimurem_renategara_lemimalam.pdfIn PDF document text
    • http://blu-ital.space/maths_frameworking_3.3_answers9ed73.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/3dcfb643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puxejinasor.epizy.com/horse_games_online.pdfIn PDF document text
    • http://xojutavuvexiso.rf.gd/merefuxipod.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/1827221417.pdfIn PDF document text
    • http://jupejorix.epizy.com/cantilena_font_free.pdfIn PDF document text
    • http://kukuvil.epizy.com/absence_letter_format_for_students.pdfIn PDF document text
    • http://pezazutosoxa.epizy.com/room_booking_system_free_download.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_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 5056 bytes
SHA-256: 56fb6e1a50ad5957c33223c3e274d3f92cfcc210ee21f113e7675bc29cb1a74f
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 11076 bytes
SHA-256: 4025e0750d38284477306e4a4d5c65a71679dab92a7406b023c54b64c2b29a9d

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