Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab7644080c830db…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 15:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13da53413f854da95d454220fa9d0ec0 SHA-1: 19c984607c35005a31460cf2a0fdad78cfa78277 SHA-256: 3ab7644080c830db63d93e70ab1a0114da7c860d38c8398e1f3bf1fb09ca4fdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the link farm and the ML detection strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://vhktn.at/images/content/files/52343324591.pdf
    • http://babywagen24.de/userfiles/file/75237653761.pdf
    • http://thamdinhgiadaiquang.com/img/files/zekodokoxub.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d7fab0fb9d4fe0da19f55aecc28962d4/37953819447.pdf
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/25060334196.pdf
    • http://rickgrisolia.com/userfiles/files/30972985902.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/87183940875.pdf
    • http://designklasse.de/ckfinder/userfiles/files/wekejarinoromowukukaka.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/4465872740.pdf
    • http://galsabino.it/userfiles/files/duxepidir.pdf
    • https://vitanov.rs/files/92836191323.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kefevuvovegigixukomaw.pdf
    • http://yuanhebiotech.com/upload/files/kanemug.pdf
    • http://asiadomainstore.com/userfiles/file/41885398497.pdf
    • https://fotojursa.cz/userfiles/file/89251589633.pdf
    • http://robedecreateur.com/img/files/64096382716.pdf
    • http://yuqiaohome.com/uploads/files/202109111528454063.pdf
    • http://ecole.ru/text/images/file/58557749924.pdf
    • http://dezmaster.com/userfiles/file/19403720569.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/2263263056.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/mogud.pdf
    • https://kultmotor.hu/images/files/54393755795.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cannot+copy+files+from+pc+to+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b722.bin
4d5f2596170787aac08d7483a6e63ded6c9e099f4c6a57406df937a72ba19f76
pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 19320 bytes
font_01_sfnt_off0000e8ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 16792 bytes
font_02_sfnt_off00010103.bin
1805b0202db8ebcfcef84c62cc34b2d5b6dcdf3b0e2345c71b768e7d01a79f98
pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 11028 bytes