Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f24badd72fd378…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 17:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: feb6776dad75f9c2cd2a2733722eb5d6 SHA-1: c096313796fd159ff6f40e3e00248a7f2541ee31 SHA-256: c9f24badd72fd3783294547bcf7b93278bb99519f44af1a193a59bda951081e1
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to external PDF files hosted on various domains. The presence of 'utm_term_redirector=True' and the sheer number of distinct hosts suggest an attempt to obscure the true destination or distribute malicious content through a network of redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ruihuitax.com/files/file/32828597511.pdf In PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/65684674314.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/91000052521.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/kezofujepuxopa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/22446023200.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/94966291693.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xawojibabogufojej.pdfIn PDF document text
    • https://linker.tw/files/sivibowojafokikokor.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vobatawukofotikomise.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/89457808126.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/96213425594.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/jilifinir.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/9164974059.pdfIn PDF document text
    • http://origo.ws/userfiles/file/rivaveguxurevos.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/77664738588.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/49969626258.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/sazamakadokeponasopabig.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/49604898547.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/36136688520.pdfIn PDF document text
    • http://hiniceshine.com/upload/10557696060.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/53458229856.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/zixubewode.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7961551b4c185e24f7d29fd53870883e/tobufuzibapefuvomawuwaf.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/paresuzuzidobunukek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=night+at+the+museum+full+movie+online+freePDF 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_off0000b105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 10804 bytes
SHA-256: 3f579d02480f69f134b7f76e655d7b8f63c1b108c8be24c56c08390bb24507fe
font_01_sfnt_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 15004 bytes
SHA-256: 0bf835a89d905371eef940e464f6893a777227c4ce0e7716e1b2073a2cfa2069
font_02_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1