Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96862b2e0625b77…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 23:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39f3f7f64fe262c791756304d3abbfa5 SHA-1: a07403d58483074a00617e91cc43cbe76bffc774 SHA-256: e96862b2e0625b7733d4c91547fc859267ad4a8c6805444d9a0967f6c74755a1
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 embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=remove+timestamp+on+android+text+messages PDF link annotation
    • https://fong-cai.com/upload/files/56764738913.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/boxozalisi.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/losarexofalowotonovipafi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wakeperemafepuregexam.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_022809.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/66562482523.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/26716806459.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/69237984122.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/gunobolijarovitotup.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be2f9bada---90793561464.pdfIn PDF document text
    • http://rubensova16.cz/files/file/jemogavegivuwejerufid.pdfIn PDF document text
    • http://koala-al.com/d/files/26984734390.pdfIn PDF document text
    • https://pokereshop.cz/data/file/50721239630.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/41132904183.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/bokadikeleji.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/853318814.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/dixegelanixowikaxodozewi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d976fb2b---fokeposarokoni.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/goronowixijebumisotil.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/japovefarovagifewozupuz.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/jisawobupuvafivuzedosuza.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/15483526918.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/wovegovakika.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040302212278.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/fenuzafakufizawatulufebut.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 18028 bytes
SHA-256: 2707ef5c416c1e123432355aabdb48091c0ef5e5d0338ceedd213af8fa535d5d
font_01_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 10900 bytes
SHA-256: 20da5579f94d2b1e63ea55a78a10ff496639caa06c60b4d817a5b944853206a6

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