Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5bc37dddd97a04…

MALICIOUS

PDF

102.9 KB Created: 2021-09-13 19:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e3c5ad059482a96a73f2bd1196e62983 SHA-1: ab883d5058a924953e6d67efb06c6ad4126e96a5 SHA-256: 3d5bc37dddd97a045d98c7c331d4c922b0333e17b676020e62eae93537f9ad91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a phishing or trojan threat. It contains a high number of embedded URLs pointing to various PDF files, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to a network of potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://goooinggroup.com/userfiles/files/20210905_041220.pdf In PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/64157000752.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/47051853191.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lejoxa.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030628003089.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/52780461622.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/98055531799.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210901_181A0056C7A6336C.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/21836428673.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/livutufuxukunumizuxo.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/newotarewil.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/12182842851.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/12761605800.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191154453.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/60179678759.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_115CD5A2E0BDA8D9.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/pudire.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210905154513.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/pojurumuv.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/48157041435.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/52206818017.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76395804023.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/sawat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=skam+france+english+subtitles+season+1PDF link annotation
    • 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_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 21360 bytes
SHA-256: 874d063a2b5ffa95ba8cebe25ff9a7c210e54fa43d69e1e814a758637674dfd8
font_01_sfnt_off00015b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17378 11240 bytes
SHA-256: 9abc89c6aaaf0af7ccb04b74588768368f20ccc1770812f0c6a66dcd35e8953b

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