Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aae3288980abaf…

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 07:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 39c75bcc6e92158170a7b7aff5e3a1ca SHA-1: 62682cfb3ef89de7a2e33754bbef2e40b19a3aad SHA-256: 26aae3288980abaf1411660d14d90f6fde78f106b61f1131a214826b08fed606
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=logiciel+navigation+aerienne+android PDF link annotation
    • http://shengnabei.com/uploadfile/file///2021090610142949.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/vepitikap.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/bagubekalelugerelo.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/sYg7UHCfGtQ8.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zinekerelerom.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/popevokawiwudov.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59699864900.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/dipobonetowadubawe.pdfIn PDF document text
    • http://sdes.in/uploads/57367567616.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/wakumew.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/92719751981.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/weruvopuga.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/jepimozabuveziwunese.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/489706420.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/sajufejizadutowa.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jiminemurubekuguvex.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/xenupubanazaguwulopibezek.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/10382601987.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/76491987428.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/13142034182.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210915_202903_107.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/nopafagotipakawoparapo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/68281305572.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/jegijosetijupesibop.pdfIn PDF document text
    • 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_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10400 bytes
SHA-256: 727778e7befd89986e35e6018e07aa89166f62f4a836dd99a97e02c035a213c4
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 19396 bytes
SHA-256: de0df21f33d807e36a7a8f147e77892efa548ca9c437dca17a9a267432258ea8
font_02_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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