Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03e44365427909e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 02:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e25dcd194ce961400decc1d3bad7636 SHA-1: b92666d1b8aa39036a51ffbc963516379343f66b SHA-256: d03e44365427909e74b00c826f59279a7b111ff429b577634ee5fab52f7c43ce
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=app+store+download+app+store PDF link annotation
    • https://kaparatt.com/images/File/50027470383.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/texileletulixekuxobog.pdfIn PDF document text
    • https://mimpishio.com/contents/files/82929881004.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/zagobutapesu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/63815762636.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/genofagesosi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394659b0be---29962773258.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/63997311446.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/31662542511.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/peranafi.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kawiwilitetemuwa.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/bagebadunadedudew.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/pufunujixelogubekiw.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/34032587554.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/87478645920.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/zivuvukafisedadine.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/54506713514.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/pavije.pdfIn PDF document text
    • https://33mobility.net/uploads/files/fonerabe.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914183134.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/78622340914.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/xuwamonemolunotuzulotemiw.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_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10360 bytes
SHA-256: 093c8ce3b66749ee5d4e7daa642b4950f911597f977fe191c0d61956b2f50fc5
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 17440 bytes
SHA-256: a3394864543ac38a98feaa5280501b7487b952978ad783273a7aeeb663e9268d

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