Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd69eff91c3724c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 02:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e238847c95c55f57e695c84bfaa41c83 SHA-1: 0c641a9ff96af2081efe0c4cd667485f666c6c9f SHA-256: 8dd69eff91c3724cc513f05b848dc28f0c5a0b9521d05c101b3406cccdf71774
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing lure. The heuristic 'SE_MFA_LURE' indicates it attempts to harvest MFA codes or session tokens. The embedded URLs point to link farms on disposable hosting, suggesting a phishing infrastructure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=vpn+shortcut+android PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614270d0d3203---bujebevudaxujiretipukek.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xepadezokag.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/40687715986.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31504028656.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403df48dca3---38594895345.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109020337554496.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///20591514194.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/75571144589.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/37910340805.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/geweriditofet.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/tukozaxigipemaburelarob.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
    • https://jin-ji.com/upload/files/81511977401.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/11614386525.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/53206479782.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/53892397339.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nojowalud.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/94446958964.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/bowosejewepisedexu.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/19058251355.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/94096640540.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/rolufuworomakalegibakuk.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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 10500 bytes
SHA-256: 7acd3c7c646d08b064b483abea1b8bfe4d050ee16f361d4c22146e5d1b3b9a42
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 16940 bytes
SHA-256: 43ec2b0bb87bad2750556cedaecde811f8f3649e817e5459d5f78e1b8dc8fcf7
font_02_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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