Malicious PDF — malware analysis report

Static analysis result for SHA-256 659fce712cb1094b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 05:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3934f935ecbf9215ade2cd5a1c0db914 SHA-1: 9d09e026b214bf7093954adac69ce30668978b4d SHA-256: 659fce712cb1094bad2213fe25414e142e9ce5b6143779ffb8412c2530a3c067
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of many embedded URLs suggests the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kommunikator.nu/demo/userfiles/file///66823605250.pdf In PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/riwerijijes.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904090413.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/91157198056.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f9db4e08---23703083665.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663084acc9---naselamesevopesukus.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/42155339489.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210908120843.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/wuzadonixovabuzo.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xujafusovuk.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913171450.pdfIn PDF document text
    • https://samudra99.com/contents/files/vitozuxepuwujabikaja.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/73654674890.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/89743334317.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/56586718487.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/45855289834.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/29722457044.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/tefavok.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/16911541810.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/87834844650.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/50920604756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=online+riemann+sum+calculatorPDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10516 bytes
SHA-256: fd51f99a3e5d00e1e823ab6b1868578bb0c52cd31ef168ab1ce314409aab8ffa
font_02_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 17652 bytes
SHA-256: c7a30248751be5b5a02b84dd2dafc8898b7b7abe16fcfdb30d5e9e215133a976

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