Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d282eb23566a9d…

MALICIOUS

PDF

77.5 KB Created: 2021-10-10 08:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1426eca45be80dac628adeac6efaca94 SHA-1: 303f6cb9ecae8e2e3495f1a35ec406e7edd09b0b SHA-256: 67d282eb23566a9d630317f003ab349e0bbed935bac7f8329648de759a88d9c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to potentially harmful content or further stages of infection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on disposable hosting, a common tactic for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://mimpishio1.com/contents/files/97191480547.pdf In PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/36775490720.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210923_090127.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/luxekusenolozo.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/lixulikoluwujogarupuvapu.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/8984768139.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/54476509898.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50cf9ee6239942e6a35bd0892801160c/gekametelozod.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/53149468654.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/kofikudedopemudotam.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nadipopa.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/wiwaselewozekativanalid.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/xesinodotewarasa.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/pomudok.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bofonuxisodav.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/lulagawedaseb.pdfIn PDF document text
    • https://redac.ch/upload/guxikose.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zaguvifirosilulefirajam.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/54960807802.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/lopalukotawukokigexubu.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/nepijejesukugo.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/mowopitago.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/76215571405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=objective+english+book+pdfPDF 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_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 11092 bytes
SHA-256: 7ea4a8b62f9dd49acebf97ec5a5572ac97f595950c81b83df142eddcad6ed3bf
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 17696 bytes
SHA-256: 77dc24caf2a312b62628bbfc611d85260ce385932c88724f42a584c2e82348b5

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