Malicious PDF — malware analysis report

Static analysis result for SHA-256 482b3a677add3285…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 05:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9771cb871719530650d7dee258deb8d0 SHA-1: 986c84257ccaab59012a05005b24b7aecfa0b63e SHA-256: 482b3a677add3285d5b0c7a59ccc6035454a9bc046536312f1b9b671beed3cd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of a link farm heuristic and numerous embedded URLs suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maternites-catholiques.org/ressource/site-image/files/fuwedifojitinuloxiz.pdf In PDF document text
    • http://didongsinhvien.com/upload/files/84406976269.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210902081813217111xgt55.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/kowumigopajexisu.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/37701662543.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/89957924497.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/gogesatokarikod.pdfIn PDF document text
    • http://livestocktool.com/d/files/mutabovozebutibonuvofusid.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/kapalaku.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/jobixisufogidoximulepudi.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/ruxebifodorapowolusa.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/losamobitata.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/22458568448.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/59280074181.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/99653847757.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/tituwixodizavapavub.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tidebimadidasuferorera.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64300036179.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/wekezisizojakuvotabafir.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/rinirumewadejowupeg.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/49718671964.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/lenazeniwizujiluruw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613326867a2bf---buvulijojawawijefi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/50737218441.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/xajesil.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/nagavaluxarijadosolofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+my+phone%27s+network+security+keyPDF 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 18248 bytes
SHA-256: 7f1d8108d095a5cbf8a5fb2012f43a413fa5167a5ed51a16c53fba4ea2fc7535
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 11092 bytes
SHA-256: 561e7d97fd229154e20178954e2016fe73405cc69af25bacf37b79917e640715