Malicious PDF — malware analysis report

Static analysis result for SHA-256 466cea411912472f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 06:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dd7afc74668b9758e48a31ad82e5398 SHA-1: 1910ed9c80466e87ddb0ce17c5e7ca71ba699a19 SHA-256: 466cea411912472fb0e0c230449eead0519c12fec204fd5597c05ccdd3291d08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to exploit vulnerabilities or deliver malicious content. Heuristics indicate a link farm and a callback phishing lure, suggesting the document's purpose is to trick the user into interacting with malicious links or calling a fraudulent number. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 http://vaithun.net/upload/files/87607798531.pdf In PDF document text
    • http://stroyvodservice.ru/upload/File/saxude.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/vozitopa.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/36244512332.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904052026354.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/59508510037.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/82899052868.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///bibifixoxepuwogotaruzi.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/61643432068.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lideloregipobobiv.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/mipudefox.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/24530890952.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/61771476653.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/63456282656.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nusotaru.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0ef76d0c---26039579035.pdfIn PDF document text
    • http://ranchobg.com/img/file/xakivisibite.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/notatudemifabuz.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/44413922698.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/famotebado.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/fezebewezedujoker.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/90393334692.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///savekawulatov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+secret+codesPDF 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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 18200 bytes
SHA-256: 175615bd38be736ffd6822859ffd6b0903922e9779771a97d312c0c88308b7d2
font_01_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 10136 bytes
SHA-256: 1f37f81400774788676380962ae1d8664a3a4693bfea4ca157641e6274687496
font_02_sfnt_off000135a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1