Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47a39857df79160…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 01:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 203f885e6a7a62fc96ea181348f38e41 SHA-1: 82abe63cbd7d87303e5f1ddb57209044b3238bdb SHA-256: d47a39857df7916038b519de385d9695f8e7352e90232e9759797a8342bc22dc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of a 'download button' lure and callback phishing indicators suggests a phishing or malware distribution scheme. The document likely aims to trick the user into downloading a payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ntct-dz.com/ckfinder/userfiles/files/19282295483.pdf In PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/ragezofepoxevapa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/95178317447.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/zulizawukamuz.pdfIn PDF document text
    • http://erpos.sk/data/files/zosoxakemejejosufetusos.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/35521237366.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210906172153.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/tunofaroxozize.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_045501.pdfIn PDF document text
    • http://winso.tw/userfiles/file/sabomuxoxesutesezuzexag.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/tazitupebumoxewepojugojeg.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/623665046.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/74303153526.pdfIn PDF document text
    • https://ntc-container.com/upload/files/bobozaxujutejupiwixewop.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/72157853441.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/mexipax.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///fetewagategewifarumap.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vewupe.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/40505955549.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/biguradoverilosipazoj.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/81210363447.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/jixijigusat.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/sisamagojoperi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spiderman+into+the+spider+verse+full+movie+watch+onlinePDF 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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 11212 bytes
SHA-256: bf018863faba94e08cd7b45f2191e31204c6603a4588b5dca9075028e00b6724
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 18232 bytes
SHA-256: 604ceb121e7e882fe6fb178c9e2d37664008e5885aaf9bdd42afdcfdf58104f5
font_02_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1