Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8a048372e95315…

MALICIOUS

PDF

92.5 KB Created: 2021-03-18 08:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 339916c8e88aaf3248505a5bb43fdad7 SHA-1: 999022f4325cdcb85f1e86ddd356a984197fa9d1 SHA-256: bd8a048372e95315f6a82e1341e17defbd2a1830c1f87fd149b8b1558261e4e9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/award?keyword=vert+shock+pdf PDF link annotation
    • http://rollernefritmassage.xyz/532455624661r6fg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fce26295e151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_604e34f5f0d1c.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/bsc_magazine_august_2020.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/buffers_ph.pdfIn PDF document text
    • http://mybatut.store/runner_fish_picturep74tx.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/ley_1010_del_2006_acoso_laboral_en_colombia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd6007e666fe.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/vertical_axis_wind_turbine_advantages_and_disadvantages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_600ea66c0a34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_601555fa75314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b8778a-1aab-4b18-980c-5a84b68a7683/xokaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c26e77d-e9ac-451f-b4fe-4a072349976f/how_to_recover_my_facebook_password_without_changing_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2f4a38-4b92-4b7b-aaca-c77b646bf51b/81201144166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5578ebd-670a-4915-a6a2-53db161d2cf2/83769201348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502f4068-005b-4960-ba3e-45bf2c9b6e5f/scott_pilgrim_comic_color_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09748df6-3e28-42b2-8b4a-03d3e68cd9f6/ximopobolukafudegamug.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/what_type_of_expense_is_freight_considered.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://scripts.sil.org/OFLIn 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_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 5032 bytes
SHA-256: f25a6a137fdb5a68d593c27d6139e120ddb1028f611feb2ba3140badaa66e130
font_01_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 11412 bytes
SHA-256: 3f4aafcd5aee2549e906a5da116315629f650f8961d556297edc01afc16175c9
font_02_sfnt_off00014e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E52 16740 bytes
SHA-256: c595e57ef259ce17c5093c97552c8df1a581d7a4cd7933d34349330b50ffdc3f