Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4058aebf7fd66da…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 21:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 2243c40abed7a72a36b631b21a2aa623 SHA-1: db9b8e4e03bf669761ab8b549bf968468c70c290 SHA-256: a4058aebf7fd66da2114772bc8a133e3b2b4c208a457e892aa57a199725087ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smidgel.ru/uplcv?utm_term=fz+movie+app+download PDF link annotation
    • https://prokoncept.hu/admin/blogfck/image/file/71895983901.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210916/file/jubupapepupebepev.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/54170864529.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/bupibivakimikivetewa.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/dodipesorasujojesu.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/gumusijus.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/wesebon.pdfIn PDF document text
    • https://training-access.com/upload/file/38047325548.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/61136108766.pdfIn PDF document text
    • http://opersan.com/file/35030377224.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161489e065b4a4---84432901976.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/74728178131.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/wovomejonus.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bulopasokatevejuxav.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/88304846240.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/mazosibexozetuzirezelif.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/fagisazowopexatezer.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/rowoposewefitefirulevexi.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/38455462878.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb64c38c9c---pekenagamiluju.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/bajipazerib.pdfIn PDF document text
    • http://metall-press.ru/files/rupekutuj.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://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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 17936 bytes
SHA-256: 94b24afa3e8a0519e9c049b959c4a555adda6f978166f07340679561e193e9d2
font_02_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 10376 bytes
SHA-256: 8ca537809cc5f4fba09e89acd3a9dc6f9f04ae9ce035536349571b1afb7e302f

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