Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac94ae8e865cf39…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 06:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83e8086ad02a3f3cfcd33d9d5f355072 SHA-1: e7e53f52aa8937fee559ca74c9f2d95a4ef547b3 SHA-256: bac94ae8e865cf3901a11fe4912159bd2ee97ec1b850f0a09e02b3ea30477420
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=aplicacion+para+ver+mis+archivos+en+android PDF link annotation
    • https://inprovitparaguay.com/ckfinder/userfiles/files/senoburobuforafaxi.pdfIn PDF document text
    • https://pixel.bg/img/file/40183151926.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2ea7ffae---judavipugejesafabo.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/13235853467.pdfIn PDF document text
    • http://villkasz.hu/editor_up/jexikadari.pdfIn PDF document text
    • http://innotack.com/userfiles/file/dugolomevavewevagigibot.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/83384575762.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/fowasodofel.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/mikifowefesokepadutumedu.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/saguwapavotabivak.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/tifefajelajufulavava.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/54482890770.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vomadulinunuvemasizadi.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/turusupoxi.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/69555354590.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/lalegipuz.pdfIn PDF document text
    • http://m2m2design.com/userfiles/26496158713.pdfIn PDF document text
    • https://arendic.cl/files/siwonobituguvasen.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/61668481337.pdfIn PDF document text
    • https://beautydent.hu/editor_up/60284971676.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/23892302625.pdfIn PDF document text
    • https://senegal4d.com/contents/files/2295525268.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/gakeferor.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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 10728 bytes
SHA-256: e467b9b8cec05dfc33de73b9a49b5d95ae1f6bd1684d38182380526d32f4ec75
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 19832 bytes
SHA-256: f908f1f1c32510d97c64ff7e89a2aab29e411cb8c560e1a90d683a0a919c8a76
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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