Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf16c6135cbf7fc3…

MALICIOUS

PDF

95.9 KB Created: 2021-10-10 16:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 80659c370632bf6bc67ce78d33905ee9 SHA-1: 55f4b00b6d4e5ceafcff6a7f336d0ddc09127a4b SHA-256: cf16c6135cbf7fc3af3da296d1cf517a4353593d5dd9d08a32eab108ea5dd1dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://smidgel.ru/uplcv?utm_term=stormy+monday+blues+allman+brothers PDF link annotation
    • http://art4you.sk/editor_uploads/system/files/fijadozidigevitipezo.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/18071095130.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210917003734.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/posijesulajobifa.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/643225799.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/neragatibekewagusotamefa.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109181919208874.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/31301865944.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/44262468706.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/wepologopupunu.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/wasomoliferan.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090814002449.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/47765058843.pdfIn PDF document text
    • http://myredm.ru/uploads/file/71023492876.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/maroxot.pdfIn PDF document text
    • http://chinalabware.ru/d/files/19141248114.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/mererupe.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/riniziwefe.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/89614965089.pdfIn PDF document text
    • http://tykhchem.com/upload/files/8731710469.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/39781613116.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/vubovuwu.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_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10848 bytes
SHA-256: 62ed0160245adbdf089cb9e18e2e81a8251636b34d6f3747aa51cd0c1103bc3e
font_01_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 20608 bytes
SHA-256: bbbe7a3eac8bdf5675bcc1112f1e0ee51ff4bf86b90d13b39bb2ba7fbf21611d

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