Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf338775fc8cc6f1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 10:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 748d185a5675057a0aceba42e52aa7f3 SHA-1: f28d9de0f91f476fb26bb363cd0bfcf0babe7d99 SHA-256: bf338775fc8cc6f19d83d7d135a3f056b1258110d7fae800c5d3e056d880ba8e
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and external URIs, indicating a potential for malicious activity. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. While the document body is unreadable, the combination of heuristics and embedded scripts points to a malicious intent to deceive the user.

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.
  • 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://www.photonics-science.com/ckfinder/userfiles/files/wosagipasaguvujiset.pdf In PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090203380273499.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tunekerajorifewejinup.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210908041507.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/valobi.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/xiregetopotobel.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/8706525754.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/95531115197.pdfIn PDF document text
    • https://granitnet.hu/editor_up/naxudulatunomup.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/rageb.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/83294085259.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/dizovifujuluxukekimed.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/zatuzebepimukofekel.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/96846566795.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/38544288682.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/6498730476.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/josinidodumi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/88099562218.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/nedatapeno.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vuritidabipibofazil.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e75781ea---48712449089.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/lulaboduxutalobutipejubim.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/79992807511.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/8521171382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=managerial+economics+pdfPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/sivuvasipuluxuzuvijapus.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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10856 bytes
SHA-256: 706c064056bc6fb4d6d6deae23c002feaec0cdc45d78493c15fd28ef19ef2225
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 18096 bytes
SHA-256: 176af77de4c803f588ca985a53504022135caa8c0dc42e1dfe630b3c9ebe9f41