Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a025c772ef76f1…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f682424997be4b47bed185f88c064530 SHA-1: c164ea02690d46ba744546af5cf7dd33f10d1615 SHA-256: c6a025c772ef76f1bc47d7d3b660bb2384f11ed4a41612c1f8d3135d7e8a98ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is structured as an image-only document with an action trigger, typical of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates a screenshot-like appearance designed to trick users into clicking a malicious link. The embedded JavaScript and numerous external URIs suggest an attempt to download or redirect to malicious content.

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 67 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 http://cambresisemploi.fr/ckfinder/userfiles/files/gifipemuxirot.pdf In PDF document text
    • http://medi-sen.com/files/files/warotozugil.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/65200643809.pdfIn PDF document text
    • http://annabarons.com/files/files/mukafadufexuzujotexa.pdfIn PDF document text
    • http://uchid.com/uploads/file/kabijewivenul.pdfIn PDF document text
    • http://grupophi.es/uploads/files/42524882738.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/wirivowasinupabik.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/tidivexexanosiwajigu.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/vubonakegosotikagekezasu.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613B593C5CB71.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mofudedogixi.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/kilositagesunubifixol.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zufumejatasotub.pdfIn PDF document text
    • https://hoongnau.com/upload/files/25622519030.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/dizuge.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/13929984618.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/19197879204.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/62380704332.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/jesexezafuxugapozemegu.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/32912529667.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4a37bac5b4f0432520759163bd10b469/11136967775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=organ+2020+apkPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/95585783321.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 14396 bytes
SHA-256: d1c819b66da413219cc4b00763bde42c3ef9addc1f3962a469092112b9a52cf5
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 10128 bytes
SHA-256: 2478cecb16a9936849baf581e0d84b6212033553a80ad97d4b3ec1010fb2d71d
font_02_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1