Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57886e7e1faabce…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b140e8b13c25538187e7e87a2081ba6 SHA-1: b9d764cca484ea3e8799a2795d528b7b84ff4c8e SHA-256: c57886e7e1faabce6508ce603dc981738b8466d4342aa00239ef11d9a5d22736
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=epub+drm+removal+android
    • http://spostojow.pl/userfiles/file/38155165096.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210901_A5C0B9D52E01496C.pdf
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/85902704918.pdf
    • https://mimzyonline.com/userfiles/file/zogumimakawubuv.pdf
    • http://sartoriaventurini.com/userfiles/files/vewurukegotagafuj.pdf
    • http://duszek-lasu.pl/userfiles/file/tasidikorod.pdf
    • http://writtenmail.com/upload_images/file/6566838958.pdf
    • https://ikansambel.com/contents/files/finukilupovibegizivadu.pdf
    • http://hk-keber.de/images/file/pomigewasarofoxiruzifof.pdf
    • http://consol.hu/images/uploadedimages/file/88862850063.pdf
    • https://bistakalikotenetwork.com/userfiles/file/82661215192.pdf
    • https://chataigne-cevennes.fr/imgs/files/85399709745.pdf
    • https://myreply.mobi/snappshott/editor//file/makodogaginurapepenab.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/83341859575.pdf
    • http://xinyuemu.net/assets/202109/files/20210907113045637873.pdf
    • https://suprizpin.com/calisma2/files/uploads/xamogemunosonog.pdf
    • https://kiptep.ru/file/garivikukokepikikewilowo.pdf
    • http://whuntex.ru/userfiles/file/39113382683.pdf
    • http://machinegroup.ru/img/outer/files/fakiwixurilisibofuzaro.pdf
    • https://easy2ticket.com/upload/files/vazitonevitozaxasi.pdf
    • http://china-zub.ru/userfiles/file/8061105942.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/xejulavutoluzuduvixuw.pdf
    • http://meubelenindex.nl/images/uploads/bagigumumanibuxi.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6eb61cc40---48184214916.pdf
    • http://haciogullari.com/depo/sayfaresim/file/94323535767.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_off0000da2b.bin
2a4277897d6dbd997bea8b39f1ae1774279f9f733233bf8c00b1307475d03759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 17320 bytes
font_01_sfnt_off0001073b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 16792 bytes
font_02_sfnt_off00011f52.bin
ed917ec65ab1898c9d54cf7c7f289a7b3b22714ef997585e956147809dd58f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 10576 bytes

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