Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb41b96131d7aef…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 09:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e55cf698156963415289c52e081102c4 SHA-1: 2c2131b2010ec6e8ceff21b6d3631fb34894cc7d SHA-256: 8bb41b96131d7aef2f421bfef61f0ec0aa02b5fdab6eb6a09b60bfaad36be5aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=five+nights+at+freddy%27s+free+unblocked PDF link annotation
    • http://kiko168.com/UploadFile/file/20210919052131252.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/68641317372.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/58840582617.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/wobimagesev.pdfIn PDF document text
    • http://inistor.com/ufiles/files/kifiwasulifunal.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/joperuxuzawafuvigugivaxiw.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/44199881956.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/783263929.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/ridedopedekajedulex.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/venibamakasodakow.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40943608038.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dibiz.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/lomegafipevoxorunasotupam.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e4121677---48245809539.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/barudafaviradatax.pdfIn PDF document text
    • https://eclearusa.com/images/file/77055265231.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/9950270859.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/50840805793.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/46296226207.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/rikoninumokubixukap.pdfIn PDF document text
    • http://geoman.cz/data/file/39026572852.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/zokiwudivugubojevigija.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/bizabodopekikibedosow.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/59115341142.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2790a424a7b058d1fa7c84c0ea86c9e6/pojamilemumuzupita.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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 17672 bytes
SHA-256: 67f8780855a22be2d03af1bad3d58daccdde114e42f22c9defaf40cbac2e6876
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 11276 bytes
SHA-256: 5e69deaebccc30273b88d8e94cc2daeeff7d391badc0574a12f50fb636d2af8b