Malicious PDF — malware analysis report

Static analysis result for SHA-256 46816434ad54fa79…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 06:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 458bd7880fa59036626ef0ecb7011315 SHA-1: c7a25e8b6dc118f9067959b3f178b8452f3d0104 SHA-256: 46816434ad54fa79a407fec71d69f218743b60686226a15fa2fa2187a338b8ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish for information. The presence of external URIs and the overall structure suggest an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=pre+emergence+damping+off PDF link annotation
    • https://speedwayinfo.hu/uploads/file/wajitokaditak.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fijig.pdfIn PDF document text
    • http://spiregene.com/image/files/20210901_182306.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/fonozexosozimodid.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/37645313847.pdfIn PDF document text
    • https://posh.hr/files/wanesunamosig.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/93556160303.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/fakatifitutebojaxixeveve.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/jugofozifebib.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/fakaxiwepazi.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/44084167725.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vumulewakobet.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/wanikitivenepibogivemipe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b2gabdu5u8bf4ugpaiekoijm2l/liboluxewubuzu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/36080969347.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_213827_9641.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/keririxazuw.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/74227354616.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/51106848331.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/fijir.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/33033251875.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/59217333797.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/10734807791.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/7380359167.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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 10652 bytes
SHA-256: 76ff98889e96e99b15919b30aa7c54d57aae4405527b543466d8969be3ae89b5
font_01_sfnt_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 17476 bytes
SHA-256: c8c75bab6cbde1764258b4b29dcd13cfea8314b93879c49db74a3556ab58d365
font_02_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1