Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8cfa41bbf5428d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 03:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9428c9524b3115ed717aefd589fcd43b SHA-1: c1d21cf20a1b5dbf51c97c9c06522b24bf17f17a SHA-256: 4d8cfa41bbf5428dccce628c354e3a29c7766786ea8b2d2ab3c71222b2ea24ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it is intended to redirect users to potentially harmful external sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=file+ppsspp+lego+batman PDF link annotation
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meforuxonubetojosoperi.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/75222421234.pdfIn PDF document text
    • http://tion.hu/upload/file/78732965064.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/nufomi.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/radaromig.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/69052710073.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kufakexukaravebiwil.pdfIn PDF document text
    • http://kmsenior.org/file/files/webizerepanukufifim.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zibotavezujekobike.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zokatuteposusegidulul.pdfIn PDF document text
    • http://scarpatti.com/files/85809582181.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/74954816137.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/65352443160.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/46267420721.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c5dcf80b---20595888509.pdfIn PDF document text
    • http://aa-nusd.jp/roxifujusoj.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/61231174001.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/23131353507.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/vibevulabovajabefabep.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/dupowumugo.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/53022218271.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/xegekubajuramer.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/mivapawepaduwisegovaner.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/67605454207.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/45051462063.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_off0000b750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB750 10612 bytes
SHA-256: 6f31d950e9cb4c6ee7b23cf785ac7e2ce67219577c126d2acd85647ae55fd0aa
font_01_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 16376 bytes
SHA-256: 0dd439a542d6391dd34a3f8ea4a37d9b47f078bdec166048929c46354ddf77de

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