Malicious PDF — malware analysis report

Static analysis result for SHA-256 685f870131782fa5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 12:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c65406714fa7cdf380393e53123560ff SHA-1: 2da3e20cd1e5dc34e20f57e890b14ee82d56230b SHA-256: 685f870131782fa508dfc5aaa0dccec9573927d0eec21480a74fd6360590cdd3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links to other PDF files, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://pokeocncafe.com/uploads/files/59708511263.pdf In PDF document text
    • http://guanzhuli.com/userfiles/file/povatosaguxetotafofarum.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/40464813287.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/sirugexebomu.pdfIn PDF document text
    • http://test-immo.com/file/bewobelerelawamegakum.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/98157856532.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/9197579749.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/76776192311.pdfIn PDF document text
    • http://ruihuitax.com/files/file/19881164485.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/kopodaxofoneg.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/35407612019.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/50545304859.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/7550761744.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/33268199673.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf156f92e---19236467879.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/zefalovadeg.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d6013268---xozowobipedobudodukar.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/486107602613ab5305f032.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109020222430732.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/wujutifowazo.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/daseze.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/galubo.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/85459592711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hero+420+bengali+movie+watch+online+freePDF link annotation
    • 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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 18168 bytes
SHA-256: 52b70198abe2671e5bc665b39a452152f074fa00d9d42869bae348706c6b457e
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 11220 bytes
SHA-256: 3d7f60d7ebcfb09b74d4ed4fc519aea42cb981132500305dacabf1a09229e872

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