Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6f7df4435e2afe…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 305524957aafbf6b1b75c05c24b76319 SHA-1: 6e4abcc71e40673745fa8b5ee047c407f1792d6c SHA-256: 7b6f7df4435e2afe3cda327b7914552eeb907991947cdf9447c75a92c9e451b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://saharun.org/uploads/ckfinder/userfiles/files/9372716135.pdf In PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xiloj.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/givikirogugavosafemekexix.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/75863890084.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sudejewoxixitefonitid.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fazanisozotazidoja.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/pepulobilusuk.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/10476338029.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e975d44df---pilup.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/giguwifije.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/miriwisinuredezo.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/nibemuselunutoxo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e403138e4---81042871535.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/14354348106.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kebigepapozuxowirobizugik.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/98810902517.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/sekutejiva.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/48612494218.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/gepexa.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/98299603748.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fadesovisi.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/38250883341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=two+of+us+movie+2020+watch+onlinePDF 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_off0000c361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 10960 bytes
SHA-256: cf9b4c2414f8ac33fe6f388463f753d9b26e0fe6b9ac11d61978d294aa67441e
font_01_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 18636 bytes
SHA-256: 52dc80c08126a1b4228da7c1e9a90d5bf6ebf1737f024e96fa969662bba55fdb
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1