Malicious PDF — malware analysis report

Static analysis result for SHA-256 1450e294af1dcfe5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 15:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 652d1e4925578bf113eef8353ab16251 SHA-1: 0836fc5b6c6def8354d230eabe8f24c9d6eee639 SHA-256: 1450e294af1dcfe51f98f871d5f589e0f3a6b1610455a1423b72b7c053a45f41
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kerama.altrodesign.eu/ckfinder/userfiles/files/81037207899.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/21020728293.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/79754550714.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161300c2e7db7b---mosibufezaxukinatowuz.pdf
    • https://immo-macedo.lu/userfiles/files/47524091836.pdf
    • http://mexxeopaint.com/upload/files/1714116719.pdf
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/losafujusalibepi.pdf
    • http://sperrincaravans.com/images/file/76264940866.pdf
    • http://koddous.com/userfiles/file/patodivosegulib.pdf
    • http://inruho.ru/ckfinder/userfiles/files/45090996440.pdf
    • http://elite-nails.pl/Upload/file/jonunaripuxurozagumij.pdf
    • https://mangonebike.com/uploads/file/74616122964.pdf
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/32620599164.pdf
    • http://cuacuonbinhduong.com/upload/files/48788761270.pdf
    • http://kayapalinakliyat.net/file/11279524007.pdf
    • http://gurolmumcu.com/userfiles/file/wuvivijag.pdf
    • http://fujiya-burbank.com/uploads/files/vixozumuwizar.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/5082061601.pdf
    • http://cascad-trans.ru/files/gikuxopidowagobim.pdf
    • http://kielcenoca.pl/files/file/98768495011.pdf
    • https://theelementrama9.com/userfiles/files/1292394525.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56299961727.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161402b76110b3---72659624211.pdf
    • http://shamayachts.com/upload/file/45004781970.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/genabet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=periodic+table+labeled+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcce.bin
3867011f1f8528a4469ca7ad2948089b6322daf0d02d00c103a0955f529c508a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 17912 bytes
font_01_sfnt_off00010b21.bin
eda157e21bc5ef7fcaa1212b4ea796a74a2d15e4975826d8324d2fbbbdf15d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 10480 bytes
font_02_sfnt_off000122cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 16792 bytes

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