Malicious PDF — malware analysis report

Static analysis result for SHA-256 87955dea0823c272…

MALICIOUS

PDF

90.6 KB Created: 2021-10-14 04:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f8a31c414aa9932a6fb42749b765ed3 SHA-1: 9f5bbbb358937c2c3db3268ccbf80f7a07d523f6 SHA-256: 87955dea0823c27295a27c5f0c93e3f13714962dfe8ca20392c7123b7a4edc85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that host PDF files, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://jnvhardoi.org/ckfinder/userfiles/files/33410924372.pdf In PDF document text
    • http://firesecurity.sk/userfiles/file/28255411163.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/savosagapojebokobafotexu.pdfIn PDF document text
    • http://construction-calc.com/userfiles/file/miwonebup.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/zaxanelutibi.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/72252377347.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/28475384256.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/47361704942.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/28532922523.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sesogo.pdfIn PDF document text
    • https://mkontroll.hu/File/34987164596.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/befafujorivitugawakixeluk.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/92829939209.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/bivuxegigiwagoxa.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/2427870267.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/76325309202.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/tutakobopeb.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16140e96fe4864---fopurejomuwojex.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/fisiromefofiligiloxafa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161434e0cdfa5e---tutenasanevumujeguvosaw.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/53780095726.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/20337010057.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dexipixunijiromaloriz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=kotler+and+lee+2005PDF 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_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 20212 bytes
SHA-256: ddca2ee318fd2c93ec29e1f4644c819eebfbf64ea47252fe7c8140f8727161dd
font_02_sfnt_off000145ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 10348 bytes
SHA-256: a7ee9b5f85790ed63ff7ffb7fec789082bd6b51de300bcabc6200910a2acb83a

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