Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5070ed0ec9eafa…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a8777af16c7f5c9a9cbb1a2ed045ffa SHA-1: a134e5b1f63bada9c901a727edec5219241c5a7c SHA-256: ba5070ed0ec9eafa3ce0813cb87c87233637d6b00bd2d341d4f439398d24c91c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://smidgel.ru/uplcv?utm_term=have+a+great+day+funny+gif PDF link annotation
    • https://grancom.by/upload/docs/sozufobuvob.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/55434389449.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/38951140897.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/kedufetukozodibubos.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92fe4978d---56901042867.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/mifux.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49281069035.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nibobanezo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kopatewaxiw.pdfIn PDF document text
    • https://membermimpi.com/contents/files/72765001829.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/jowidapekodupazedexoguxe.pdfIn PDF document text
    • https://dacola.com/upload/files/xokizowutibefarezawu.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/laxakebanopidazubisupet.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/8926542965.pdfIn PDF document text
    • http://15881588.com/ckupload/files/92136040864.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/99304507499.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/85078272749.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210903232521.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/6732228523.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631199599.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/45496600430.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bufavi.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/bidakinexupufuvazaz.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/vijametevivewizupejux.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/tutulebenemusedabidaka.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/bafakamukizotivotorazag.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_off0000bcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD2 17424 bytes
SHA-256: 0430ff2b0922ff5eba7117d497ac290517ac31108ff11a2830f3722bf55ef48b
font_01_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10464 bytes
SHA-256: f2c60d43312f3f5a767c6ac00cb2a00428f902b0f3ba45b984ed49e0d1310ac1
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1