Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77b8ef451e424ee…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 08:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e11e38e44ff43701ee4af0cc1c84248c SHA-1: d8d6c52c79a32c5a8a851670879dc759dbaed9a8 SHA-256: a77b8ef451e424ee57873365f0c1860be4d971cc821308f7c5afef3af06fb540
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan delivery attempt. The embedded JavaScript and the document's structure suggest it's designed as a lure, likely to redirect users to malicious sites or download further payloads. The presence of numerous external URIs, many on disposable hosting, reinforces the phishing nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=perfectly+elastic+products+examples PDF link annotation
    • http://capmar.eu/userfiles/file/garipa.pdfIn PDF document text
    • https://polytex.de/sites/default/files/79584145116.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/49338321522.pdfIn PDF document text
    • http://freeorden.com/media/file/binod.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/kuniperonatiwosa.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/85869647678.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/16054000692.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/makevumonelijorevefa.pdfIn PDF document text
    • http://trevorhannant.com/bujuturajafimidarat.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/6475653872.pdfIn PDF document text
    • https://isleo.com/i_photos/file/14819433979.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/1275997909.pdfIn PDF document text
    • http://superbarter.sk/media/file/zavovelutowepubiwinimix.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/direm.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/watawabunov.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/12085976592.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70379684977.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/fizobawu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/57170992146.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/43117874969.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/1009623890.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/71917697159.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_off0000afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA6 10992 bytes
SHA-256: 523bab0174b50f59bbada154ec546718fb4c7fd8015195debd18b40408278ef6
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 14316 bytes
SHA-256: 5fbf6b673fc93ff51c2458aa7e6de9a6fee7991a609521e323c0eec0125f6433
font_02_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1