Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd59c00866ccff79…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 02:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf4d24f971d9b2e20a99514020d8ad96 SHA-1: 50633e059fe6021cf224e57f61726fdb7a71eda3 SHA-256: cd59c00866ccff79a4e6b4ed22d00e46adb6bb5c75e4c29da7e4d00fa518dff0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://anpheatingandac.com/nbloom/fckuploads/file/33541673191.pdf In PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/8489297783.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328e426e5fc---8089059414.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/44706292355.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/64543524694.pdfIn PDF document text
    • http://lse.hu/userfiles/file/zekabixi.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/jelozowafug.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/porupanipetizogofesoviwu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/xasawakefuzofenob.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kesije.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/11859370359.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/38124229689.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/57602591172.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/78817288044.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/44502801921.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45816814499.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tezerukefosapuroniku.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/10775185618.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/14911544373.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/disujagixegobuxis.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f565d771de---52839956967.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210917/file/16319022146767.pdfIn PDF document text
    • http://juncheng.tw/upload/files/bezuvowabugolijuxoni.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/20287867576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+watch+roohi+movie+onlinePDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 17596 bytes
SHA-256: 00b4ef71ee11dbdca2e8337d1e573261634644800af5e826d9f84769606d5f40
font_01_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 10472 bytes
SHA-256: c491d5e114f8876fd9fd98bcf21a81dc1fdf517d81312465c6ed84e755c1d972
font_02_sfnt_off00013ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1