Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0f1369adc0f968…

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 05:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fab1d3077718a6d6b6996852e718c948 SHA-1: 0dafcbe9bf733c78d0443039249a45fa183d0f22 SHA-256: ca0f1369adc0f968ca31e487d802939c15251a3866aeb3dd71206450f6bfeedb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating it attempts to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via a second-stage PDF. The presence of multiple PDF links and a link farm heuristic further supports a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aawyx.com/sites/default/imageuser/file/72245751210.pdf In PDF document text
    • http://nagakuratrading.com/js/upload/files/xitexibobibi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135152faa7fe---wilagejasazimezizuv.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/39389349842.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/22289125550.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/garezuzo.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/ruluwuzorugis.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109100008369781.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tatabagepapemiwuwo.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/55800090020.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/fuwejufeburuz.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/32066543870.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_200951_8397.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/busafaj.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/karorajabuwejowusefe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/64178a4b89ca2250b76009f3766b4ca1/bobifoduxanile.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/24767658604.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/15920205219.pdfIn PDF document text
    • https://advik.net/userfiles/file/44534346451.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/84325833055.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/weniburefibuwowe.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/rugom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=weather+widget+missing+androidPDF 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_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 18712 bytes
SHA-256: 0044b2352267de9ea92635a81d687ada5343e6b527ca6c7455f5eeff9ade6a2e
font_01_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 10728 bytes
SHA-256: b672acbd679f603481f761435e52aa8ccdd362ca27af7dfbe1c27776cc7a9cb1
font_02_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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