Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c14c3be425dc81f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 14:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7975293e8899059d3f5df2417b175d7e SHA-1: 0c49167a7373f4056390701642335a9164fedb9b SHA-256: 5c14c3be425dc81faeec286456883b332ec10cfd2812c66fbe3872b4e9a4a89a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple external links, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the structure and numerous links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://vouchertiket.com/airplane/ckeditor/uploads/files/20035592366.pdf In PDF document text
    • http://mijn-nederland.nl/userfiles/file/12937925805.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/fajomosufasufogusij.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/53515630624.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/poxukemedu.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fepavafawomi.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/pisisosatosaw.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/27192475085.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/96026521083.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/numine.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/lepatidujebana.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/nunarukamopulupinuzininuw.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/raluzosakusomeruwa.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/lotunota.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/karivenutipifodok.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80280049863.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/dudid.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/16988981160.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/falaranan.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/sojubiwarakufobuzepar.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/bizofesamijodimawiriguv.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/sodabowejunezizufuga.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sigiranejevefadixivom.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/27895798566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=race+2016+full+movie+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ea56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEA56 18956 bytes
SHA-256: 2a50afd1bd6ef5b459bb4cf91dc52b7908119528320d32c0f319a3427228e774
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 20356 bytes
SHA-256: 6436742633b76a9b72be82187594bb360247033fdf8e3ffbc1e42a2f1b485cd9

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