Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ade92bb169530c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 03:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4386ad49180f0c72911feb3d1461f619 SHA-1: c9794e07292ad67ec86abe138deef8cc3c8e5c9e SHA-256: c8ade92bb169530c443d73279ce93579b9beb9a3c262f1d842cbbceaa0dddf27
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing attacks, designed to trick users into clicking embedded links. The heuristic 'PDF_IMAGE_LURE' and the presence of numerous external URIs on disposable hosting strongly suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=capas+tarlac+zip+code PDF link annotation
    • http://ivankotov.ru/img/lib/file/jirok.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/62850517242.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/64136147295.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/lofitutomi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82125551666.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/68736007253.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/riwofajedi.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/44536353376.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/supanajijuzexadif.pdfIn PDF document text
    • http://nemalipics.com/51483200244.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/85357846878.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/32093532460.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/37964345422.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/wudokupegipaxotosanab.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/21982974315.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614401d06ffa3---66529645780.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/darogezapojapetider.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/7625698264.pdfIn PDF document text
    • https://alkoplast.rs/files/82164859561.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/n29u5ire64trcs6lm866qpcctq/motogobumuxofiwotakofe.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/49231031467.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/gitinufevatigigegixexa.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In 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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 10492 bytes
SHA-256: b49eda895ae4411ed124f9df5cfd378cb0a439521a57d6b0352739cb9cf28c76
font_01_sfnt_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 14372 bytes
SHA-256: 3a14a1df824c7678861f5ec60222fce4e898cb24d0537d9e1e83a5c663bb9a26
font_02_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1