Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9fac6929b6d2ad…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 07:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78e5dae03917987b24dbb171d7a78763 SHA-1: e03105c4cc9384027e92738bacd13c8773b7d2a4 SHA-256: 4c9fac6929b6d2ad683c20c3e0c640fa4830600d03522557d0a7db4a9438ff8d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or redirection attempt. The primary goal appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dryoucosmeceutical.com/userfiles/files/66330056005.pdf In PDF document text
    • http://geometrabottero.it/userfiles/files/27031236117.pdfIn PDF document text
    • http://orem.mn/uploads/files/tiribuxonogugibamepi.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/9676650157.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/51362072260.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/36544582460.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kixafusebatilalofusuzi.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/11711813163.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/bojaku.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/losamunanifipulirixalesu.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/92420099162.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/raduwasujagujig.pdfIn PDF document text
    • https://electroagro.es/pub/files/zadovudusuvulujefam.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee302aef28---21909241390.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kufotew.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/26040979036.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/povor.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/57345561442.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/terudazuri.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/17741615518.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/94200526996.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/64632798107.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/29389541490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=packet+loss+test+androidPDF 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_off0000b6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D4 15924 bytes
SHA-256: c69ccc9512bed959fa9ba5e1076021ce91f97500133c6e0450d712b6f877b23b
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10456 bytes
SHA-256: 83b7cbec991421d41a5f17924947d4ca97824804ad519fb422e24a541dab6d16

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