Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fe40957dc60f1a…

MALICIOUS

PDF

63.6 KB Created: 2021-09-21 01:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cf621cdbe5c3e81a4284bf97711114c SHA-1: eec5c959a3d9adf3d967bbb46014bcd5ec60eef1 SHA-256: f7fe40957dc60f1a4a11bc200b5b7d50e3646070c3b4b5271bbe5a13783571d8
124 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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
  • 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://synerhu.ru/uplcv?utm_term=best+android+app+to+limit+screen+time PDF link annotation
    • https://aslplastic.com/ckfinder/userfiles/files/xulakixaxizobuwefesopif.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/56118106493.pdfIn PDF document text
    • http://sireny.net/share/files/45297668481.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogugawabudok.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109110549267218.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/zafajewe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_3E1BE5570E57B7F7.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/13510411699.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a097f99a026b63f03f7e46ece3f19e3b/36748342506.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/12952505618.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/fuwokenuvazaxekidexa.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/10161725376.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/52092877349.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/54739759901.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/12927127097.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613545eb51025---wutotiwopowidimuzixur.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/zedawipivatas.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/rokirososuduwupipuwajabil.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/80392675534.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_D6E414D218C24C12.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/pozemob.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tetakupivolimo.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/saliwakatogenobibalugev.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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