Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e4ebb3897fb734…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 00:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16c593b8e44e08569fa4c61015633e84 SHA-1: 2be6acfa147273d9f359ec4ff671700f5a6d6cd1 SHA-256: 68e4ebb3897fb734761685388c16dbe232f66b8a67aaa1f7e3f155403eb578c0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URIs, with a medium-severity heuristic flagging a link pointing directly to an IP address, indicating a potential phishing or malware distribution attempt. The PDF also exhibits characteristics of a link farm hosted on disposable domains, further supporting a malicious intent to redirect users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://altus.pl/userfiles/file/2732365861.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/wuzimejipo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/12527005684.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/fagudowubomonufar.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f176d3700---24215448999.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/lurotuwesinipopinovatodar.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/95814336860.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/josojatusenorogofeseji.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/sobamexopafeperoge.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/renoxukuwizapono.pdfIn PDF document text
    • http://pb-book.com/user_file/file/2825990867.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/50422474758.pdfIn PDF document text
    • http://dejede.com/userfiles/file/12462330540.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/makavumemabewowirojelelun.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/gininedaxikowabomi.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/jafutobeletipawedonavi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/janojepirov.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea4c7efb4---1511266175.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/48383195732.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/witimitorekuwanovipabido.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/55200046168.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353211f3470---85502339608.pdfPDF link annotation
    • https://kiptep.ru/file/lirewir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=funny+helicopter+gifPDF 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_off0000cfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 18620 bytes
SHA-256: 01a87654313ae2a54e6576ccc0dee06775f07f37a6a4f3db3e9b959393481f47
font_02_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 10620 bytes
SHA-256: c38f92b696a1c41ac4c3de4a042a3f6faee2fddaa7a67c99390c2d8123249310