Malicious PDF — malware analysis report

Static analysis result for SHA-256 3195bd329a81b683…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 433cdfd4b6f7c6a4ee9f9ca38a8fdce5 SHA-1: 3353e97c2fa46b566b7b325c2b93d14cd6b31292 SHA-256: 3195bd329a81b68368e6679b0c33ed2ddd08b6135d692da6dae34f7a45bdbce5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. The PDF contains numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting an attempt to lure users to potentially malicious websites. No scripts were extracted, but the presence of multiple external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=ken%27s+guide+to+the+bible+pdf PDF link annotation
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/kenenowefiruxanopofafonut.pdfIn PDF document text
    • http://tavio.su/files/file/xunalowemesogexegoliji.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nuxotifuveluxoruzoposonan.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/mugufaruzeloribel.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/97524344203.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/32476960510.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/rinedubomopibupuvavab.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/52148516028.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/65103984315.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/11333493255.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/puroxunuzimuj.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/62890685346.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/75488771630.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bakofet.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/nejasexikila.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/gowofo.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/fuvapiredatifeko.pdfIn PDF document text
    • https://windsbs.biz/files/file/toxubobobaxoxinosevuwomav.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gawinetodufedeze.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/visexatejoguxoda.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kobivuwa.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/10104760740.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/kalubufotewuvexa.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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17472 bytes
SHA-256: fcb442ede0bc00881ba631adb24d8476f97268cc4cacce110edcc30cf31d4d61
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10780 bytes
SHA-256: 316b7dd32fe6535a0818bc05b6e4fac6e7fe583492ae01329667ee74d5e6a4a4

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