Malicious PDF — malware analysis report

Static analysis result for SHA-256 f942d17a56c495ac…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 23:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c74ea741b291bb537fb4dc1febd7d47a SHA-1: 031cfd2132396530ab7feb99599b61c7d2377760 SHA-256: f942d17a56c495ac92e729c4a14b4c0fe50ba96f2a5e03f75de31174d7a72643
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to deliver malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pmfegypt.com/userfiles/files/pozunuvuwojamova.pdf In PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/zosawigijosemusegojum.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/65839112665.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/dezigunuma.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13747794043.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/21751671949.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/wutizexo.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/fixemiwuzedobepiwewazod.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/37548505206.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/16764680668.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/refatisudikejozed.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/wiwonadibaxomasegadu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/sopusegipesefewuraxim.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/jizixanirabasinel.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/xovamadisuzatanolabu.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/44593421662.pdfIn PDF document text
    • https://nada70.org/userfiles/file/30121742408.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/16382289661.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tevixakitiniweraxitemu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/74756993394.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/pezadiloronaxotilugotido.pdfIn PDF document text
    • http://mc-opony.pl/files/file/morenejifabofabezukikewox.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/bodibixupuzaxaw.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210915_4A474F5015284415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+best+base+ideasPDF 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_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 17232 bytes
SHA-256: d3c9ce52794ca0929a51f720dab5a9e9fe138a40c6b7ccc18e11e2c16bf086ec
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 10436 bytes
SHA-256: 2949f2561c8f7710f9cec975f68714c7536553746b516ffe804b21547347914f