Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a780d3536c3b14…

MALICIOUS

PDF

78.5 KB Created: 2021-10-05 00:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b85d081bf44f8336fd9c90b1662ff34d SHA-1: ac0d01f9cd95a017513e2bb5b13af193f6a3e0fc SHA-256: d3a780d3536c3b14386d1e83ffa835f1e3f9c1f98b0a319d98db94d5f1bc9f44
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nakatarikaszel.pl/app/webroot/userfiles/file/rabipura.pdf In PDF document text
    • https://mountmoriahcamp.com/media/12711985672.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/68862247230.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/nasipanotuzofo.pdfIn PDF document text
    • http://rs-entp.com/upload/file/71380920882.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/39033889912.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/mimisizoseratorajese.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/5735382013.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/porelor.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/33177955068.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/lapoxitiridubusokiduk.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/58903491798.pdfIn PDF document text
    • http://htygroup.com/upload/files/biboxevupujibabuwazopew.pdfIn PDF document text
    • http://sinostandards.net/upload/files/fudipafuvurarome.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/22393712297.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/35747997632.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/gisitewavojebaxipemamamep.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/27765757498.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wuxubafepuzirusobog.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/56a4a6bd404c7148c83cd7f5b2cf11ad/sorotek.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/96757020396.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/3364196101.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lulagizesanaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=loggia+meaning+in+englishPDF 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_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 20412 bytes
SHA-256: 985b78d5e2cdb2eb4969fbbc811b70b9f99e76f8c2740ea4fe138164318e29a4
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10312 bytes
SHA-256: b5941302221de5dc13ff9d07268f27ee523231ca512824ebe6d69f4fb116e5bb
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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