Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1b13b96f31c36e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 13:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f060d83d5acf4426874f44a3e00e5aaf SHA-1: 1829dfdcd20ec569d4bb00b5e87aeb785f712cc0 SHA-256: 7a1b13b96f31c36e21050ced29423bd39cdc6f91e3593f58e272491a678edafc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and using UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=phone+codes+hack PDF link annotation
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/refuwotatamevatipokaxenep.pdfIn PDF document text
    • http://houselandia.ru/files/lusavoludukifa.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kusovebobogovokuzoteguzex.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/55758011916.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/xudajogopexivulat.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/39142727930.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/58156687655.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/zikuw.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210916020628.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/rumaperokimogisos.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/20668714164.pdfIn PDF document text
    • http://klsele.com/userfiles/file/1632481420.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gowotadef.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904205130622.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/pegum.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/n7jvc1fkn8kbao5oaqhv85v44h/vizanu.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/4011968444.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jidejas.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/52624176205.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/45601430259.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/zegigibedewobazorijeto.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/35805128480.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_off0000b24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 17816 bytes
SHA-256: fb7df48a49a11beb9c1581ad0413214c0824cdef4f20c652a59b9ad37f373a86
font_01_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 10224 bytes
SHA-256: d8e4bc396879c8cd2ae7b25a879209268e24e4d28192258a0eaa3f76d20349b5
font_02_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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