Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b18696d2b6fb026…

MALICIOUS

PDF

102.5 KB Created: 2021-09-16 08:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 840aab9eb72e90f1090961033a7f94e7 SHA-1: c393e6557870b2e22f61dc1fb622c49d0db23b96 SHA-256: 3b18696d2b6fb026881b63e7294bd40421e4408f1c61cc2fafad2cb83f4035f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the PDF as a link farm on disposable hosting, reinforcing the attack pattern. No scripts were extracted, but the presence of many external URIs suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://pistant.ru/uplcv?utm_term=red+dawn+1984+putlocker PDF link annotation
    • http://saxonrt.hu/img/userfiles/files/26245391096.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/7589325497.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/wogosafotubufi.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/xalitatikemexevuto.pdfIn PDF document text
    • https://parfumzone.ro/files/file/muxolin.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/bajetaguwu.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/bidetitos.pdfIn PDF document text
    • http://355353.ru/userfiles/file/radubasapaluvin.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/44519270745.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/94573396218.pdfIn PDF document text
    • http://chinahongji.com/d/files/padajadeto.pdfIn PDF document text
    • http://vucert.vn/uploads/files/kidosupemixoda.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e13b2448050aa528f9a98f8feb6f5bb0/vemomuj.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/65938693640.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/89065392080.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/3406798635.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904013758.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210913135216.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/89103632961.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/58626069348.pdfIn PDF document text
    • http://varvshistoriska.com/file/75838396158.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/53a1358fa7a2c55e0c27bd57409a7712/37738735497.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_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 19940 bytes
SHA-256: bcb6a4fd56572e431e201584b067a08f8340e51a29e7a853c41cfd0420ed92c8
font_01_sfnt_off00015b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001734e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734E 11076 bytes
SHA-256: f2593ad5a0b4a442696df0d8c7684643983b05274dc609a3836407974ea49141

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