Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e906fee1a4cd73…

MALICIOUS

PDF

98.0 KB Created: 2021-09-23 17:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 288bf8360a14e860ab0a91e348d48146 SHA-1: b176e643648be7af62df71b458c5a1a0fca3793f SHA-256: 31e906fee1a4cd73bf462eaca0c6cbf251d9d73dae016aa541582c83b7d1ef48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection scheme. The PDF structure and embedded links suggest an attempt to direct users to malicious websites, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=business+law+book+pdf+semester+1 PDF link annotation
    • http://futimisdev.com/userfiles/file/56065180039.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/jumitofar.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/90670224816.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210920100702.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/13042244732.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/fumivixekeridodavaf.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/janojepirov.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/zopegefepozavojukinobodo.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/98879993463.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/2366932239.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/97065659898.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109100005571309.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/zodevovuzigokukotiwivut.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02960295d---bevojowuwugofimivudola.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/54627286996.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodamufebo.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/vitururalobipixemalur.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/59730716526.pdfIn PDF document text
    • http://kunbot.com/upload/files/69405418107.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/womexabanixexadute.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/19835539754.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/saximulu.pdfIn PDF document text
    • 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_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 11180 bytes
SHA-256: 01e527b955ab474a239601defccf29fd946406f84c348f635ade5ce57f8e2ca4
font_01_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B64 18260 bytes
SHA-256: 644eb16f455fea38c564b68d5a3094fac710bc6daa66742c6e033f32b7c2eee7

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