Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadf50152979302b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-15 21:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1201fe56e4f0dbb5be6058c2b2a99008 SHA-1: 72de6c1c5f1c490252e73e9e7c2a70d8a49b655e SHA-256: eadf50152979302bdbc7565deeb7b1a469cd088253ee534e1f04c0dc3b775759
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crewmak.ru/uplcv?utm_term=hunter+x+hunter+ant+arc+season PDF link annotation
    • http://pro-group.ru/userfiles/files/29456086404.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/34670833382.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/10200181106.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614230e91a578---23311895243.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/pawenafusofagedikoguvu.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/ponewilaxopajeresejog.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/2602791747.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c70ce3f4632ce63bda5782bed77faa64/73397324142.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/69788047932.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/rodijuwukefi.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/vaxezutitanupiraladavimen.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/65694195737.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/95224191825.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/92111400338.pdfIn PDF document text
    • http://irinabailey.com/upload/files/19768716055.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/33816555804.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/38930670107.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/rataro.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/75814644625.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/nevojejeko.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/vejufanozamub.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/revofasisapama.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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 16596 bytes
SHA-256: f6df9b743ea3adb64f688fc8ac1e7c7d6f429b3d34e2ce5df76f55ded1ca7c5b
font_02_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10384 bytes
SHA-256: d666b076ca7b534d98e42fc07ab02c1bb49fa5a51a8941d2cdef49012b2dc622

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