Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aff932d87186f9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 16:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21fde32ce5ce08a33c62422a1c2891f7 SHA-1: 0b72007179456c45fb703f7a0503dd0484e4160b SHA-256: a0aff932d87186f92e9165eb49d26450f4931b2b9f226aad64c6d1790e727fca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=pokemon+emerald+shiny+starter+cheat PDF link annotation
    • http://azbuka-d.ru/ckfinder/userfiles/files/kekewizirovajufugamenu.pdfIn PDF document text
    • http://vit-physio.de/file/32830538254.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/99202618792.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/dekivun.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/31251972261.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/89358694480.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/1973671879.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/dunoko.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c48a638a79677f8ab39034398e2632ae/sufek.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/zutamotukenebu.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wesegolukimamikudose.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/95317061944.pdfIn PDF document text
    • http://canadianrockies.info/files/file/delemu.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/90154839862.pdfIn PDF document text
    • http://104408017.linker.tw/files/12206797995.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/70200705254.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/zadigenejudozafi.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/62734252554.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/73482695789.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/befewisibalalero.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sajowinapexikuderamu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/93757173481.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/nuluzevuwitusufomevenav.pdfIn PDF document text
    • 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_off0000ade9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE9 15708 bytes
SHA-256: ec4792e795ff9674b674c2ddc0a494adf90fad72a33e8a25ef4a8b3d61c7ccf7
font_01_sfnt_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10844 bytes
SHA-256: ca2cfbf2543656844b19f4e6d092c85ac6e7ee2f73653c63aed1ec383fd00a9f

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