Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff423a6109f4d66d…

MALICIOUS

PDF

101.6 KB Created: 2021-09-23 08:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e1f6285709d045172f58ce65e24f6e3 SHA-1: dfc3687730fb8bb15fff137f151f3b8760ee3efe SHA-256: ff423a6109f4d66d71a29382731082aeb1cd5ade5e958e332767efaec05773d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one specifically crafted with a 'minecraft download' term, suggests a phishing or malware distribution attempt. The PDF structure itself is identified as a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=minecraft+pe+latest+version+free+apk+download PDF link annotation
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/88712018391.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902203154_820998256.pdfIn PDF document text
    • http://dansobentre.net/uploads/file/todonidilulam.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/56756033915.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/xezaluranelitizigimuvokob.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/sonumiwizakexuz.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/75263969106.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/jowonapusufetitoroxesuke.pdfIn PDF document text
    • https://hse.tw/upload/file/jojagutenen.pdfIn PDF document text
    • https://eclearusa.com/images/file/wugoxovuzajalimokexeki.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/ropimuretidajosubo.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/3248314312.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/15032435555.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/49235899831.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/14054440335.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/32563702856.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/30932049247.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/25510182973.pdfIn PDF document text
    • http://reylab.com/userfiles/file/mokemajobulizam.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210922_F60B052F941D85B1.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sirumipunefedavero.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba1206542b---biwukijedajiwukabifamere.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_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 17624 bytes
SHA-256: 90896f1e7c3b48c1ba94a5340af7512e6b95d84d8651d8d3a45770f236d94108
font_01_sfnt_off0001566f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566F 10848 bytes
SHA-256: bc9f35a0adb6168f2a383656a0ea0cef4a691283bc21469e1b508e39fad8644a
font_02_sfnt_off00016fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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