Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f4bae96ac9ff1d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 11:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f5428b6bb8e68d565810abe137a68c9 SHA-1: 68e4302f399a8b9449b991e4ac838eea62ea0787 SHA-256: d8f4bae96ac9ff1dcbc642a0f4a906de38e3efccede7d9c4b9bbc3b647d0c12b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or abuse multi-factor authentication. The presence of numerous external URLs, particularly the one associated with 'PDF_SEO_DISPOSABLE_LINK_FARM', points towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://philabc.ru/uplcv?utm_term=minecraft+original+account+list PDF link annotation
    • http://studiocalderini.it/userfiles/files/13381579703.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/lejakuxe.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/21055923229.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902105020.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/damejejanojupuluzegif.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/38392611677.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/22102912755.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/87377837281.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/dadigubozevub.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca645b69c---23939994471.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/nutivomojepizu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vujabajibusafofewifezof.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/kuzidat.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/kapavuwe.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88541384518.pdfIn PDF document text
    • https://angem.fr/userfiles/file/seritatige.pdfIn PDF document text
    • http://ebus.cn/up_file/file/muniw.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090608181067.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/91199611435.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/jeponuwagawaruwusawed.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sinix.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fekudiv.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/3075981858.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 19004 bytes
SHA-256: 92c23fe90d2885da74974cf6cf51c7a467de0736af4a6ea1d4bd79a016448180
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10604 bytes
SHA-256: f5d2492feafb267caca85d4ca75eaf2d006393b26b5148448701b1a941879270

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