Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8621429e6ffeb43…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 14:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fce56680d7c79679b561222952568dec SHA-1: d31194c0dd9bbdcebabf51c40292eda1c58b62a0 SHA-256: a8621429e6ffeb43164df4aef41ee70f82b405f1baff4df9653fac75cd18335a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of multiple unknown URLs suggests a potential download or redirection mechanism, likely initiated by user interaction with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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 69 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 http://hyunbulsa.org/~ewedd2/userfiles/file/duneg.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/23893902124.pdfIn PDF document text
    • http://cl-pub.com/files/files/jesit.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/dezuk.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/kerogesagudimexixu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da2d57b5c1---20765917732.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/85651929235.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/6551359489.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/86118357925.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/38474847781.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/9141023957.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/tukez.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wivomurowe.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/kusasuza.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/gigoxodomagobi.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/98750820086.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/77461749999.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/72983087697.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/47084285145.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/xufawama.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313509968bd---vapexisasesima.pdfIn PDF document text
    • https://o-dance.com/upload/files/41653575293.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/posefotisewafutuvufititax.pdfIn PDF document text
    • http://synphabase.ch/upload/file/sezekiwusomime.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/92692408213.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/75814368763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bigg+boss+tamil+season+4+free+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_off0000b3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 10828 bytes
SHA-256: defc682da15bcfccf9f4b39f98f664829fff9f5292fea8e02d52eb2f4de48d8c
font_02_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 13896 bytes
SHA-256: 027b109ca8a8d29c6b34b1a7d2c1c1bb62b228533f2c9adb2dbc8cc60be34dda