Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4bff8f4e268cf8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 11:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae7119c257bcae2b4c25659fdde7bb3d SHA-1: 171e179f4960d7710d4cf8e9545ce2006a67f12b SHA-256: ff4bff8f4e268cf833da73da0cbf7ebfa9aea9db6c1f4fd2c2e1b4b011691c8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the document's structure and embedded URLs point towards luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=prynt+the+first+instant+camera+case+for+iphone+and+android PDF link annotation
    • http://pcserviszlin.cz/ckfinder/userfiles/files/80788499435.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/43537022069.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/mosujegobudetomakov.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/67813683151.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/92608357995.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/zakavufolokizojetaneroxoj.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092408534873499.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6f4b5c4d---11250592550.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/fuzuragenavoxafid.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/ropoberujasowaf.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905045710226.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/46209250399.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/37482007399.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/26642597579.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/negupepeta.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/23641050819.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/misojulid.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/47242661967.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/biritupo.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/39480813464.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/31171811402.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/dagebaxuxe.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_off0000ac99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC99 10956 bytes
SHA-256: d84e5338de9aa726d9a68fab2504e87b2b166afa487664fecc874c99739d29de
font_01_sfnt_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16600 bytes
SHA-256: e132b9cba0f9d936da69deecd71bb59558bde11b8a78ca5061f47d1578e04bd6

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