Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7277fe709896ec…

MALICIOUS

PDF

102.3 KB Created: 2021-09-12 04:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 101e50a6852b536bf93b9c267ed20cad SHA-1: 99e168ea53e0682c651fdcc88d0df8506a781e00 SHA-256: 5a7277fe709896ecb311d3d414824705ea5b69d3edd5d555474c4c2aaebda2f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript is likely used to obfuscate the malicious links or to perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://motoren-adachi.com/js/upload/files/dazajevivajana.pdf In PDF document text
    • http://tochalco.com/uploads/files/zidoxizisamubetuliranow.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c037dceba1cb71a65a8572ec938086b0/rakudegisodovovawefej.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/90079486868.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/kinuton.pdfIn PDF document text
    • http://portableandcool.com/files/files/569911569.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/mufitezutilogupasikil.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60870451437.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/tuxarofemogeledorenevaxod.pdfIn PDF document text
    • http://ed-union05.ru/files/file/lugabivuxepisawe.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/22528235781.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/dagexaxu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/16000873985.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pomosotawetid.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/rosepeduxabad.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/77668070387.pdfIn PDF document text
    • http://vln.nl/files/file/16655909271.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/23203198291.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/tafulivobexi.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rufisuwakano.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210912005336.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/manorasekuruwu.pdfIn PDF document text
    • http://caramelitos.sk/files/biruduwixak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+snapchat+screenshot+without+them+knowingPDF 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_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 19624 bytes
SHA-256: 531dfa6edb1e0f7777b286c173bc3eaaabd1216312661a9d953d921975dda1ef
font_01_sfnt_off00015943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001715a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715A 11044 bytes
SHA-256: 5624195e65efc5f9e85ed5c22d9fb93b62f47fab15c56f1d41db5f2953d5448f

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