Malicious PDF — malware analysis report

Static analysis result for SHA-256 9350986816f04c2c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 03:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a451a78d9fe344466f79ad43a0f1ec1 SHA-1: 7e072f995d929f70e3aae4adca7bcc94c8ef49ca SHA-256: 9350986816f04c2c3b2220702135982b7873d97e62de09154aed0b67a9cba253
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic specifically flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://arndt-fahrschule.de/userfiles/file/87741188210.pdf In PDF document text
    • https://bushregenerators.com/userfiles/files/14925008993.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/selesisi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pukajiralizijuletukejizi.pdfIn PDF document text
    • https://revive.fashion/upload/files/40764514618.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/50994164546.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/82208691717.pdfIn PDF document text
    • https://nistd.in/userfiles/file/87875815770.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/80414398979.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/veloviberatu.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/nomunezobib.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/55252777824.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/95475822289.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xavuzegigepukadadofirozu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632116905768035048.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/64407940245.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/17330461177.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/68066653220.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/vebuwevevukeror.pdfIn PDF document text
    • https://cristalensi.com/public/File/22563948255.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/rofegezeraroxod.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/44227811040.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/kivadanegixifevov.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7074f7e82449a3818219300aee52b5a2/79801866691.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/folowirubetujawuxalemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kodi+links+2021PDF 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_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 14764 bytes
SHA-256: a6d445771a31933e39018decb2b7049932e866e11149b24e2e3b9687b7e175e0
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10124 bytes
SHA-256: e97daa15016a1122ca0de2f957f1dd8088b0a50c71de49979e6045e2a5474c79
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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