Malicious PDF — malware analysis report

Static analysis result for SHA-256 239e648603c6f27d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 17:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8278a3e1d85771e155ee713254dba0f0 SHA-1: 37c20a4ebcf81f24a06b347116e542225b5ecbfc SHA-256: 239e648603c6f27d954cdaeac6a09dd732f1ecbd58b528656211f3166b6c001c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=add+chrome+link+to+desktop PDF link annotation
    • http://heimundsicherheit.de/userfiles/file/jegutikomuzarix.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/39996134903.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/91777787787.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/68908348326.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/45211673290.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/65536103334.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/mepitivas.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/vagunolupopamojudafemu.pdfIn PDF document text
    • http://artistprasanna.com/userfiles/file/finukoberoruk.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/watevazagetijitamawivaku.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/miteninofujexet.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/vewoxetilokafejaj.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/lewemagepa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/18eervlskob48ec2uan3i521l4/18313321820.pdfIn PDF document text
    • http://unseretochter.com/images/file/rolajusomogibegonud.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pobufodedotujusixa.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/37939685178.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/60413109975.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/53195966668.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/bugipe.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/35778753596.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/12549367128.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/57826140580.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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16016 bytes
SHA-256: 16058fb95a2dcead33e38788f8c1a4849745aa8758d28e3a95e2f2cd5d04dd16
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 10688 bytes
SHA-256: 682eac1f25861e9c2f326caefbb7664bfaa5662251012dc71b2fc9f4cd59d955

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