Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe045857e6aece40…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 22:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f1939312eb6c6d81dbf573415e18292 SHA-1: ab180760153b9c40f965b8e68c3e387388d03702 SHA-256: fe045857e6aece40975352575920ac812a963d30425aae67526709ea5c0adddc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to potentially malicious or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97e210d88b8c0afe97fa77f029161552/36785674455.pdf In PDF document text
    • https://excore.hu/ckfinder/userfiles/files/vinijewasodoxedelofisabi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jonomejakor.pdfIn PDF document text
    • http://lodoshosting.com/calisma2/files/uploads/fudige.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/10998200836.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/78378962263.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/63010866281.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/27522343390.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/rebivamowibelodisafeb.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/87464883776.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210918_154752.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/34944843529.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zesaduwefa.pdfIn PDF document text
    • http://asfalon.com/__files/file/80897104587.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/71954039621.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dupebivo.pdfIn PDF document text
    • https://megashina24.ru/files/files/39329804326.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/71547224463.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/kivitapivipom.pdfIn PDF document text
    • http://serting.eu/userfiles/files/nibikuvozerupika.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a119d927---jimumatejifiwuferu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/63354272947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=videoder+apk+premiumPDF link annotation
    • 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 10296 bytes
SHA-256: 938ed5839ab2e2feeb85e32d080f43e5a8e40dd20a52a2ce9ed8fd1644cdde25
font_02_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 17260 bytes
SHA-256: 4e9d47a84448a99f6612cb22d712c33b44c5c4bbe4e2df42c02b6fb598de4fc0

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