Malicious PDF — malware analysis report

Static analysis result for SHA-256 b842498990166871…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 19:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e40850ed2e9693056a214d8ea282ffb SHA-1: e276b9743fef1326a053449ee94bb6ff99ef0df7 SHA-256: b8424989901668718b750f3ed834bd07a7a6ba51f3303c01804c4d6d5e974d1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's structure as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external URIs strongly suggests the PDF's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=molecular+weight+of+ethanoic+acid
    • http://rlangkhan.com/upload/userfiles/files/zafunojesumavupe.pdf
    • https://saptabangunmanunggal.com/indomobils/upload/file/tazenizawewi.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/surofi.pdf
    • http://jhdjt.com/images/upload/File/tinopipenuniwo.pdf
    • http://mexxeopaint.com/upload/files/gaxoweja.pdf
    • http://yevres.fr/ckfinder/userfiles/files/97255985720.pdf
    • http://mwflower.com/upimagesfile///xubozefuwezawumex.pdf
    • http://chronocertif.com/userfiles/file/61255755768.pdf
    • https://spotiverify.com/ci/userfiles/files/fuzisuxolinidunizez.pdf
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/9506473292.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fojisusotelu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c65da8b---pojufediwul.pdf
    • https://sanghvicranes.com/staging/media/355125307.pdf
    • http://khyljg.com/uploadfiles/files/93813438288.pdf
    • http://omatsuri.kr/data/userfiles/files/nafir.pdf
    • https://prosaison.fr/userfiles/files/buvimusuzofasu.pdf
    • https://prestinieurope.ch/userfiles/files/gijajimexuzanikumukazomu.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/jagasiguvu.pdf
    • http://hyswimpool.com/userfiles/mawefagupijulozuzizomis.pdf
    • http://skncn.com/u/files/14466999968.pdf
    • http://geyikkimya.com/userfiles/upload/file/betedukunemolu.pdf
    • https://laflammerouge.ch/userfiles/files/86608705782.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/4213313874.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/viziwuko.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7fc4f61---tifevovuxarutizipipe.pdf
    • http://leebyenghun.com/new/upload/board/files/xujaguvilusijemoruko.pdf
    • http://afghansolar.com/userfiles/file/feropoxosoretesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf9.bin
69ce26f55612eaa6be2b0fd896531d8c40cd720e11235f2ff4be17035dc748bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 18596 bytes
font_01_sfnt_off00010f09.bin
98957908fa35702d06b62395ab7b398b3b8808ebc315512da30ce19136903132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 10768 bytes
font_02_sfnt_off0001279a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes

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