Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5c4c09c4001e37…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 06:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad858bcbf9639a7dd1837cb50d14d883 SHA-1: dcd67b7d460f41b366102a23b453a3ba73d9ae24 SHA-256: dc5c4c09c4001e3793735eef3d58874c3ee52e9211f875fbfcc76af8c1c63d45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to distribute content, likely malicious, through numerous disposable hosts. While no scripts were extracted, the presence of multiple external URIs, including those with 'download' in the UTM parameters, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://tidymoney.com/ckfinder/userfiles/files/92303138598.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/22878591023.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/71611027207.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/gegot.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/38586594053.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/savujutisiwowusipa.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/12681849171.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/gatavofubisanudik.pdfIn PDF document text
    • https://tdfstore.it/file/27782612970.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f9cc5a5---pirukonulunadumi.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/14516204177.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/61387868874.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904021918969.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/32252929999.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/lebiwen.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/15113374429.pdfIn PDF document text
    • http://unsersohn.com/images/file/90148063154.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/36942538010.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210912073427.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xuvoruzegor.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/65842684537.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/56977466500.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/348010220.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/30299597767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+xanathar%27s+guide+to+everythingPDF 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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 17472 bytes
SHA-256: 7f9d696b2e83b7fb212b9d7ae0861fb6da4740697bb90e97111767fa15bd4bbd
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 11028 bytes
SHA-256: afad9b50b2f68d6c0d93728f552a7d2a02263eb111d073749410cfc77a1845d6

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