Malicious PDF — malware analysis report

Static analysis result for SHA-256 881bf1e4b85456b3…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 09:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbf2c90ad8de32e9ee6a78e13a7bb8a3 SHA-1: 574263e716745bf1605c1fa3d1de73138835600a SHA-256: 881bf1e4b85456b385432740c4f0543bde54b226aed5d7a32724230ef32ab647
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=forever+young+song+download+mp4 PDF link annotation
    • http://sarkar.ie/userfiles/file/17913269730.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/rizoxatow.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/pogitubuvuxobafebagadulu.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/44523719293.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/debexukaresaj.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/jifuzipade.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/pataw.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161349620b4301---39578726968.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/39767321606.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/nokazupazobukirad.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/75127700085.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161399845357bd---95754409151.pdfIn PDF document text
    • http://unibox.lv/files/text/mujagepen.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/47780571556.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/55067845695.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/koxezonegirisilanokotirad.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/gawetesi.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zorafufenagekisuz.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/xafivubuji.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/34670833382.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/guneka.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kebifokotolif.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/wufovajotiwusexizonu.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_off0000b65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 10964 bytes
SHA-256: 287caef80d5495342db9424ae70d5f890548e72ef3df1bd1564c5d93a28ee8aa
font_02_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 20280 bytes
SHA-256: 7740d2c3bd714eec9cab8eddbbd1c70c4ad08e2927955b2481824b4d0290311c

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