Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62739a21a8fa0ea…

MALICIOUS

PDF

90.2 KB Created: 2021-09-12 06:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 5ee3c61236caa25c334e5e4d14b4659d SHA-1: f222cb59d04d9b43ffd4d59e9fd6ff80b4278d09 SHA-256: c62739a21a8fa0ea3b775563fceb34fa3f861b67972c73665cfa5bc9da27c05b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic analysis indicates the presence of a link farm with numerous embedded URLs, many pointing to unknown or potentially malicious domains. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://bistakalikotenetwork.com/userfiles/file/nuzipugegomijexuvasovu.pdf In PDF document text
    • http://hotelniagararimini.eu/userfiles/files/nogevofexataze.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/34951221346.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/53980672032.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/somopepuvibasunirife.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/datemusus.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/13927262770.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/10759172468.pdfIn PDF document text
    • http://rideco.hu/upload/file/xilikipotazalakufebisoru.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/58228180288.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/taguderojevokujipiwekexaf.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109061748155984.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxifabedevan.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/70663345923.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0f085c7b---dapaneb.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/83572101805.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/midomafup.pdfIn PDF document text
    • http://ixiu-23.com/uploads/files/202109020237401863.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/kanajitukepatuler.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/tevikaniledasekego.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/suvoresepiravaragasuga.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/85508093303.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/4486659835.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/45899656461.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/dofazezisiw.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • http://panteres.com/files/files/gisulawaxezonetoveruxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+pebble+and+the+penguin+hubie+and+marinaPDF 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_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 17736 bytes
SHA-256: ee86d145ea1fa316fc5c55bc3090a420a108bf01644604b3fa369fefc080b65c
font_01_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 10752 bytes
SHA-256: e97ab3f79f6bdb432252b44b86037d409f527cdc70150341817e8ad5838c10bf
font_02_sfnt_off0001429d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1