Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c86ad4faeba064…

MALICIOUS

PDF

92.4 KB Created: 2021-10-04 20:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e92b2779b8ad6411819e649f4b1a3490 SHA-1: 840e3962cb74803e717a2c37cf950f8e480bb4dc SHA-256: b3c86ad4faeba06475e282df3ea9f1ac6df88508db1a1b52df3d91f74d7b9cc4
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cargotavio.ru/files/file/satonaviwuzase.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/66679246496.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/josawupa.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/41710848184.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/86292892907.pdfIn PDF document text
    • http://clickvay.com/upload/files/xemoxinawigozonadivopesad.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/79973908916.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/zukupetijinavefutudebiwi.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/pitijexosijumir.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/36108312094.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141db08d3309---94894680853.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61743513186.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/sotazovezun.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/navinomenimivozuz.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/nixenonezami.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/83564084203.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/dufevefepurixezukinut.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/dolosafafufopijoganuzogif.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/vafojaguvixetokigivejodi.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/tegikamozigurozewovotalez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=if+life+is+a+game+these+are+the+rules+pdfPDF 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_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 10772 bytes
SHA-256: 48ceefee2a2ece47b510eaaf749b174137095c1c4d1e5457d47c2eedfc5bee2e
font_01_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 20136 bytes
SHA-256: fd828f0f6f10d1526bcf3c824eaf993a7915743adcdd21eb4aee1d7fb8b30c79
font_02_sfnt_off00014c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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