Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d1edf0a18c8b65…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b97c07e8f0b5f6201967a5e8e7e5da1e SHA-1: 4b0caa0b63e235817f3af05318d2ca468560f91e SHA-256: e5d1edf0a18c8b65c9964b09aee86df9439e75881aa3f044cb339a21f08efd4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=atkins+9th+edition+pdf PDF link annotation
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/tibobejut.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614685b3e36ba---33210322226.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/26719036491.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/57458786568.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/debonoroguvogiku.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/kejokexufapi.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/xusojawemowazojari.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/69353444166.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/duxeruf.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/77296547464.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/74354155441.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/nirin.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/38996075189.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/jajikaxefenatag.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/80985068176.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b08212c1---76803795104.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/paxazekopodamok.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/fisuwogok.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/zevavewa.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/sajibiguseki.pdfIn PDF document text
    • http://centronegozi.com/public/71781262980.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 18436 bytes
SHA-256: 33a09f81a64239f826cf5da6812a3e0d6f944447e1c002646f630cdaa1a59145
font_02_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10528 bytes
SHA-256: c34958277d72b70b111666358b8abb4cdca903ffb8636d6e508cce2528aeb8d0

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