Malicious PDF — malware analysis report

Static analysis result for SHA-256 770c6d2c806fb7d2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 04:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e41f3c1aaf59d0a5bf264626d5e686f SHA-1: 9afd7eca012dc23449e67fffda41a022c8885a09 SHA-256: 770c6d2c806fb7d27eb9a7394bd0572f1379e9e711c7396d0be5a25f3dc5c53e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting it functions as a link farm. The embedded URLs, such as https://archism.ru/uplcv?utm_term=farmville+mod+apk+download, likely lead to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=farmville+mod+apk+download PDF link annotation
    • http://safiorida.dk/operatori/userfiles/file/dejavobo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/43040497968.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090515252052.pdfIn PDF document text
    • http://www.bash.cl/media/file/42727194390.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/19295136551.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/tilaluputeb.pdfIn PDF document text
    • http://vipdiler.ru/files/file/65222434707.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/14648356433.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fesax.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/xavadalowajul.pdfIn PDF document text
    • https://kaparatt.com/images/File/5511501797.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/61437798932.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/bewivexofix.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/wanuleke.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/fobesazewakazizoluwebif.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/34899147880.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/200949515936.pdfIn PDF document text
    • http://epicridesnepal.com/files/54060646414.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/53696913778.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/wekarasuvewufu.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/26876695222.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/72089141356.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/17423571954.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_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 10508 bytes
SHA-256: 55c42b2f94e37d6fa40a5e54232eceebe51b2a21b7f548936b2cac589c55edb6
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 15656 bytes
SHA-256: ab40d09c49838f4935fc5595d069e8416af5cebc5b0a9337407e49501e0b92d9
font_02_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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