Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a552d0e182fb5e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 05:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eb6e2a602776db5de25922161ec34c86 SHA-1: f7a10c0f34309656830f8b7aa553f6f41efe3dfe SHA-256: 02a552d0e182fb5e143144e894374963ce5d40df4dbe8d5892232eb5517df0dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm on disposable hosting, coupled with numerous embedded URLs pointing to PDF files on various domains, suggests a phishing or malware distribution campaign. The document body was unreadable, but the overall structure and heuristic firings strongly indicate a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://szintai.hu/ckfinder/userfiles/files/jemegakubemogejop.pdf In PDF document text
    • http://e-hematologica.pl/users/file/namuzeduperamubimak.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/guliketoxuzedoxutaborodi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e537b9381c---topujixanazajuta.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/levubinaz.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/turedejapufimabifaja.pdfIn PDF document text
    • https://anup.bo/images/files/87877120886.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/figijuvibazezow.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b79bce6bee37f5352604c7fa70d09c3d/zerafe.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/jofewizapoxalegotejuv.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/9129035384.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/sanulanepemowogesolob.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/77795652881.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/jovaxof.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wamonexuwojenigezujov.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/20378847994.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/86249683567.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/87802998044.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/nabex.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mirek.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/83376653789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=diamond+pang+2021PDF 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_off0000ad87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD87 18868 bytes
SHA-256: 4c1948838850dad54cd25471658a7d4a49941c2fd3a2fe1c349b88e33510fff0
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10488 bytes
SHA-256: 763bfbdc1d196784fc367a38f306eebb547ffce7ea189111aa0bbbd15fef1c62

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