Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dacfcdfdf57936…

MALICIOUS

PDF

90.4 KB Created: 2021-09-11 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbdf97c33d6104019ab74704c6946eba SHA-1: 9dfbf885477c371fc3d8d39aba91b30392a98aec SHA-256: b4dacfcdfdf579363ce13c1e5f46d08dd47450b03403bf54d84fe2cb28f4c9aa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains multiple external URIs, including one pointing to a raw IP address, suggesting it acts as a lure to external malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts, reinforcing the idea of a link farm or phishing campaign. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hometeamcorp.com/images/usr/peborozezenubavu.pdf In PDF document text
    • http://mgocsm.in/userfiles/file/kexorewanigosixenidet.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/jijeluzewajunonemapisota.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/43382524927.pdfIn PDF document text
    • http://pbpharm.com/upload/files/92991758209.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/bonufezeretamudex.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f882ff1647---sobisesekegejaxolexel.pdfPDF link annotation
    • http://sunmoon-glory.com/web/upload/files/nisaxelixodetovawita.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/18646405020.pdfIn PDF document text
    • https://purefeeling8.com/data/file/rurezoserojawifadidi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc5137bd3---viluruxojikemabilazawixe.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/nozirenarekubed.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330080b6f7f---pojebowovegerilepu.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jakolomorakapibasi.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/didixejutitegevulinejexu.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gurofemararemuzujobejufuw.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/62674882765.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/tofekarenufowariwawu.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/dinamorajok.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/gijelezoworogavi.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/42780259225.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/4944286918.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/23833450949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+walking+dead+s10e13+torrentPDF 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_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 11016 bytes
SHA-256: cd7d831d3868aef992d41570762daca75838ab5dbc6d8c6d3188ef5a184f04b1
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 19052 bytes
SHA-256: 2b23208217b6909ae8033ccb5daaa1541cc13c200e5e8a329a43d83d2bc877af