Malicious PDF — malware analysis report

Static analysis result for SHA-256 b393f0be093887b6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 07:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b8303affc4e7d3846fa33f6b995b0a1 SHA-1: a0dfc21821bc836e0ec88715b581a355c253993c SHA-256: b393f0be093887b6e0632c556d38e90ab5018e4d4abafcaf6a089bbfec961a5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically pointing to a URL containing 'valiant+hearts+full+game+android', suggesting a lure for potentially pirated software or a phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=valiant+hearts+full+game+android PDF link annotation
    • http://gioithieu.btccorp.vn/uploads/files/93112952146.pdfIn PDF document text
    • http://fygl.net/uploads/file/05012644142.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/31953228954.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/30997905355.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-22/20210922143410978486.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/pobavupulenanitem.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/mavotazonududizox.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2f5de926---76066007477.pdfIn PDF document text
    • http://congluc.com/upload/files/99649316096.pdfIn PDF document text
    • http://sial.pl/galeria/file/61691393761.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/29926191537.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/91728378209.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/puludipupisoremonuguki.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/1321097932.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/rujatodep.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/31763573745.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/34735758367.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/44101863926.pdfIn PDF document text
    • http://trevorhannant.com/16911748037.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/3851803442.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/lasopo.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/15155170323.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/35518207750.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_off0000ad7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 10872 bytes
SHA-256: 03f2dabaedf4755956eba2da03b133dd9f3cd1326cc4bd8619003ff84318b97e
font_02_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 16820 bytes
SHA-256: dcc9cf7459b302f1abd3ac853bdb375177a4b220e20b9230ad62f51e69b05815

Open this report in the interactive analyzer, or submit your own file for analysis.