Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d08ca8e13b82ea…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 11:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18033a9ee87e92bcdbd474c1a5033ae5 SHA-1: a8765acd85d69be394042db2f38bf8a89c331698 SHA-256: a3d08ca8e13b82ea96e559f1ba4dc2e3bf46bd543dffa4aec2605b2705585da8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://elite-nails.pl/Upload/file/96904280656.pdf In PDF document text
    • https://xtrafitcoaching.com/www/images/files/59310820037.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/24754796286.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pinazorixirekadimulajazum.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ab18f2f3---42026108853.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/15642201607.pdfIn PDF document text
    • http://ombs.ru/uploads/files/zinuraw.pdfIn PDF document text
    • https://ms01bet.net/contents/files/dojidek.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/zukabuga.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/mexavikunibanizowuzubo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/17919800573.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/84436491091.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/buvapuguxome.pdfIn PDF document text
    • http://retailcop.ca/files/momumibedeb.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/xivaniza.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pikevenifedegosozisa.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/63398004277.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/35897236519.pdfIn PDF document text
    • http://candientuvibra.com/images/file/4050694018.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xekaxutalenevibewik.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/97188007822.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/44295906242.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/51494263779.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/92522553241.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pivetebowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=who+viewed+my+instaPDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10628 bytes
SHA-256: c77b31398e93c2ff126a1fceb793ed4a61417978d138982276cd045a225c2b0c
font_02_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 18548 bytes
SHA-256: 54fb0704a81e11caca19f21449f3999b018e34a33c75e05926dd8fa9e8eb9cba