Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b9e3cf8eac321e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 06:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3f5313bd4b066e0e9e6b57b53be066d SHA-1: 80603650a0351b2509b7c90e941100154b663b31 SHA-256: 80b9e3cf8eac321e82877d87d0c197e73d7300eb12b19ec38bfb35a915c0995c
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links for SEO manipulation or to distribute malware/phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=grown+ish+season+3+episode+9+watch+online+free PDF link annotation
    • https://rzfmuhasebe.com/userfiles/file/kikudatoguputufumegaxofe.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/salekesorumuzigapepalix.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e989456ec881f791717edb0dc72e3c61/fisodejetelavogiluvusela.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/jezorobarovedojid.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/45927388598.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/dinumisepoxek.pdfIn PDF document text
    • http://valeneighbors.com/userimages/50156250069.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/gonifekamuroz.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72886235177.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/46825592090.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/58101224805.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lapotunomi.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/wifuvepade.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • https://n-tlg.com/files/file/21180584847.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/69166893008.pdfIn PDF document text
    • http://idevoz.rs/files/35634263615.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/35096954847.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/89919729524.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/34230944462.pdfIn PDF document text
    • http://shosholoza.de/file/minugoreteviralasuze.pdfIn PDF document text
    • https://artbynela.com/uploads/file/27056251902.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/68757201798.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442f1382731---68947145667.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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 17668 bytes
SHA-256: 260ea09de16d10bf616787d8b095387bfb495f2f3dcadc7b0545c5da313c2e2a
font_02_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 11184 bytes
SHA-256: e1861b95fb1a742ca95246eccaa5c75ed5f4d5c4cb188e14c3e88eb0170b05bd