Malicious PDF — malware analysis report

Static analysis result for SHA-256 683738b6ef1a42ce…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 20:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 491eeb6a0d3a0b7bf4d8d9ca47f65a68 SHA-1: 4dc35bc7fcead3d7535fa05dc0bbc40c48155479 SHA-256: 683738b6ef1a42cea5865da4f304034e906682c09a906a899e70cbff661f2a42
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous embedded URLs, including one pointing to a link farm, suggests a phishing or malware distribution lure. Although no scripts were extracted, the overall structure and heuristics point to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://malifer.hu/upload/file/57088371444.pdf In PDF document text
    • https://hankilfood.com/upfile/files/34841366055.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/27984363316.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/fbmd3ogurn6bheccubcckrqbl2/bonix.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/78383175350.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/70335377527.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/matopana.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/baxukelumesuwebakiwom.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/28606433772.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109131006247421.pdfIn PDF document text
    • http://alkanboya.com/files/file///kiteweberatazezuri.pdfIn PDF document text
    • http://rld-carbon.ru/file/xubuvap.pdfIn PDF document text
    • http://mc-opony.pl/files/file/senobawolodafi.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/rokujabi.pdfIn PDF document text
    • http://888chji.com/userfiles/files/xuniwinikedumexizomepe.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/karevadakozo.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/bokefururitumisigedukud.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/56234521330.pdfIn PDF document text
    • https://binhvi.com/upload/files/defafizafinapetuki.pdfIn PDF document text
    • http://kelvista.lt/images/files/tulubikibubu.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/65025278158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fortnite+free+v+bucks+no+verifyPDF 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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 17940 bytes
SHA-256: 26d79f78ab1f427cc9310280d7938a15be2664382ca8484e76b596da4d8ff2e0
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 10608 bytes
SHA-256: a4df576640d269105341c3ef6ff4e7bab5d1e58042b4c40b8eb9b71fd63b1eb7

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