Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01c0e96af8a86ac…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 10:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfa51903f479dfaec3736cf70c5e8f99 SHA-1: 0ac20d78911f0664ffade32c73850278c52639a6 SHA-256: a01c0e96af8a86aca07129ee8cb3aecc7de18f70e331594a55997d48c8bc3589
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, suggesting a phishing or link-farming attempt. The presence of these URLs and the overall detection profile strongly indicate an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=official+rom+for+redmi+note+4 PDF link annotation
    • http://loscogliodifavignana.it/userfiles/files/rarenolig.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/1971919170.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e3a8b07c1205e94072c41f8411fa26b2/pugofuguvidanatawig.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vifoxanumizutisux.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/segakonewan.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/38262931281.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/23522675564.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/karifowitoju.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210902155016.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/75713972602.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/49483414724.pdfIn PDF document text
    • http://videocycling.info/files/file/52933912841.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wexikoxoputitogadoxupote.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/51287615255.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/7643552919.pdfIn PDF document text
    • https://alpinashop.bg/files/8246853957.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/39750981753.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kiwono.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/suvegegetosigebe.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/57776033102.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/gavijuxerabagatijebeb.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/14856119146.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/soditakuxisadijelit.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/99061175552.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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 17444 bytes
SHA-256: 759f072a4181382abe279e5ab550af3c62f8ace236110f3fbd27dd3bf071d661
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 10572 bytes
SHA-256: fd74af4132f5fae73f01ca4cfc055c991630e985407a5b5b2ced14a68eb7a0c8