Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6178492a725d877…

MALICIOUS

PDF

80.1 KB Created: 2021-10-14 00:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e060b667e3f8d6bbdcae9845544e58a SHA-1: b18393935336486868faf716de317d81da1a3000 SHA-256: d6178492a725d87722236d5455b18c219a624a549ce93b5bdcc01d9aa9464f74
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://master-stroi76.ru/userfiles/file/dabozajotusufepidapav.pdf In PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/49780896312.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/88171427043.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/vilugit.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/57778904575.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/liwepogawebeworut.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/zezodi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0cb6932db---49581218694.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/17352776864.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/tugilumowufar.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/58890927967.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/sugazopalefigalojogo.pdfIn PDF document text
    • https://suncables.co/images/file/tutamerir.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/rofij.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/lesedatavubikidavaf.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/dabefawaj.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/41915670857.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/wufizesonidalamidigido.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/xepiverusixufomokubasexe.pdfIn PDF document text
    • https://grouptm2.com/contents/files/44347869219.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/98347264727.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/ralopotivukubovivabowudeb.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=icd+10+code+for+peripheral+arterial+occlusive+diseasePDF 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_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 10904 bytes
SHA-256: 9c64038d06729b8421fb6a25912cd496446a537976e1fc54c4cd56a388ef739e
font_01_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 18092 bytes
SHA-256: 1197d132302e9567dfdef1cbc907b33083cf358dcc57867dbea7172f1aa567ad

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