Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bf572ea86ee045…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 23:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd5bf91fd0509b5707b4d70b6e07634d SHA-1: 915401bba5451d087a1262a1330b01cc16ba6da4 SHA-256: 49bf572ea86ee0454772fdba69093dd8c929fb2a834d2f8dd86ee54e31f71471
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to obscure the true destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests this is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161357b84da450---dasibapokezosixesatu.pdf In PDF document text
    • http://marsalanoleggio.it/userfiles/files/fepibak.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/pizube.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/99763926198.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed9d1547---66942969217.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/sakivoruv.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/ralodenonidujaxajebujir.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/17715204935.pdfIn PDF document text
    • http://quranday.org/userfiles/file/69921193940.pdfIn PDF document text
    • http://castel.lu/userfiles/files/zajibawobudozisojuri.pdfIn PDF document text
    • http://flomojapan.com/upload/files/5068779848.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/60553655429.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/tapogukaxuxuxipikigeta.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/14635226516.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/86916644760.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/dorilugevis.pdfIn PDF document text
    • http://canvangdientu.com/images/file/laweni.pdfIn PDF document text
    • http://splogservice.ru/content/files/78096551072.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/gekenixuwa.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/zokosizorupan.pdfIn PDF document text
    • http://coolscape.info/images/files/jisule.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/68763627961.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/19046747696.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/39665537420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+the+bachelor+season+25+online+free+123moviesPDF 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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 11280 bytes
SHA-256: b99e77ac60b62b801d21dd02b2a80a1573c793428dd174774eb136921b6898be
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 18476 bytes
SHA-256: b92da9ac913e3b53aebfe6cc77d63c558b12e700fcab9b3c32766d9534188a8f
font_02_sfnt_off00012438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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