Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f0dae3afb19fbe…

MALICIOUS

PDF

96.9 KB Created: 2021-09-15 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b6c241371499b914d675e638c0cd246 SHA-1: 7dcf47bbbbf63937a307b5930b07fad9312338a2 SHA-256: e7f0dae3afb19fbe299ca677909c7279db6873af60176b67a2a8e6df38705de0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://luatkhangthai.vn/upload/fck/file/302282758.pdf In PDF document text
    • https://eurosan.pl/user_images/file/68619479836.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/45549222216.pdfIn PDF document text
    • http://intersonik.eu/upload/files/jisaweforalezalo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f629635d354b4f46e93351084ca27d06/70232992967.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/tafuluvum.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95455206134.pdfIn PDF document text
    • https://moolans.com/uploads/files/foxanazomodu.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fugufuvapisupaja.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910173815990196.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/92294348930.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/81269545760.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/vojuribuzuzudoxufeb.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/55238514634.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kilesulu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/otoditoxa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130591f93ad2---83000034884.pdfIn PDF document text
    • http://denge.aero/upload/files/94702023236.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909131827.pdfIn PDF document text
    • http://bubb.cn/up_file/file/62190895503.pdfIn PDF document text
    • http://belv.ru/userfiles/file/19141462083.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///77063776436.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vawijizunekulajinozudaji.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gasemotaxi.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/tamodabumiwikix.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413aa2502a7---nesisevigufetofera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rupaul%27s+drag+race+uk+season+2+episode+10+online+freePDF 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_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 18632 bytes
SHA-256: d3f2fa6efd12b5abcbf622b8cc8c519f13e6866f45a46d78c458d090544ee85a
font_02_sfnt_off00015adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADC 11264 bytes
SHA-256: c4ee9772fa19231b6d65b6b0922fa7356092c87542908b6526c3121b3e509e6a