Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5262efbe0d94f6b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 14:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27116c179905651c8d6aedc8249b0b25 SHA-1: 3fca897677d14b04695ae35546da4da2c78bcba5 SHA-256: a5262efbe0d94f6b6b806092a0759118eb6294b82e92076966bf539a94fff141
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and ClamAV detection strongly suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=download+god+of+war+for+ppsspp+android PDF link annotation
    • https://macroedunet.com/userfiles/file/jixolumezusev.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/64168233405.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jo7enp1uj0rm0vp7bd4lf581ra/dujixuki.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210913_2B68E78E31F87596.pdfIn PDF document text
    • https://masukpt2.com/contents/files/dowasi.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210918133358.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/77207182464.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/11279198099.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/natoxovixitegugexopir.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/89718120511.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/54664558656.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/zonowori.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/22917548186.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xufojuxoxinodexa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda18de155---jegukanivogofada.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/jikep.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/67484565166.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/65680694624.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/62274104700.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pitebowud.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/74617854853.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/jadimutenolujirorek.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_off0000c04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04C 20784 bytes
SHA-256: 13f2cb6676a9b0537f3db1b4d6ede44de2e43000d1e89e4601f9bfed934497ac
font_01_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 10528 bytes
SHA-256: 5ab9c95ccd4973b9a226f619506869b292f5547183931a3b47f209e5fee6026a
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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