Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f662936626f05f…

MALICIOUS

PDF

88.7 KB Created: 2021-10-12 12:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e88fd0c403ff566e03931968f80dd0b5 SHA-1: 59deacd2aef5f428cf9e5cead57c3b5b7b6c5960 SHA-256: a9f662936626f05fa327f046f2a86269eabc2d26f833049c3415f3e4dc061c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. The document contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many URLs suggests an attempt to redirect the user to potentially malicious sites or engage in SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://csc0532.com/userfiles/file/20211012125215_s1wm57.pdf In PDF document text
    • http://technimexvn.com/images/ckeditor/files/fupesebolade.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/75165761155.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210927133211177.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tikokovobisumetokupolaxum.pdfIn PDF document text
    • https://777mto.net/contents/files/peganeg.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202110102030047122.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616320d95a72a---26966801688.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/kedirogid.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3721c0ee---jubogavemipegiraxina.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/nozenitarakuwonubedoja.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/jozuxatunawibokajik.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/bitolarawide.pdfIn PDF document text
    • http://cjatkinson.com/userimages/41016850255.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/kiniwirewofemuvekaja.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xukimotuvanewojopoza.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/kolufawojulukejagorunevur.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/pedixelariru.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/sanisididekez.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/58075566008.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/vetopegerojede.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zojit.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/86895850772.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/josuf.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/70454770055.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pisimubojifujejiju.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912011110622.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=top+mmorpg+android+2020PDF 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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 20468 bytes
SHA-256: 7bb160af704b77927b4c2ccc60fb3e48e8f70e973dae74977f25e8d00788dded
font_02_sfnt_off00013dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC7 10496 bytes
SHA-256: 0084782abc42bd9a8722317c137d904e59840d35405a24d662c88202fb350f9e