Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d94633f413da820…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 16:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc10b81b2c9eec4030fa7bf77eea6d0f SHA-1: 85ac3d62aa64685ca396c1fa70cebf7732b1f759 SHA-256: 1d94633f413da820091a2bb23097cb264d94b1cf862bb61a3bcee9fb5eb6269d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the overall structure and URL patterns point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=descargar+el+mejor+emulador+de+gba+para+android PDF link annotation
    • http://client.diffuse.info/files/zeniputuvoperobemawuduril.pdfIn PDF document text
    • http://furniture83.com/upload/files/puzebipetilagigonezifime.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/61727396396.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/purof.pdfIn PDF document text
    • https://ratoempat.com/contents/files/46214305904.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/92143028744.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/64294911437.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7843a35ad---75710522256.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/fimapanavuzifek.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/nutogukazefedan.pdfIn PDF document text
    • https://reniuved.it/file/nodarelowefanujiz.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906011658.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/20457366906.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/buvexijelabedun.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/36733813319.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/tulitonotefib.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/55968514041.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/lawobomigugikuxexito.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/70741401710.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e9dc53e4---borelalixojixo.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/zavumabubiri.pdfIn PDF document text
    • http://greenld.com/userfiles/votazivepofejinu.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/kebatumuzexuxonojujimefa.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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 19184 bytes
SHA-256: 2210e82b6ad936d9db185c11297ec49ba8c5488ea9ceb95717e0122bcb49ca21
font_01_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 11128 bytes
SHA-256: ba03af562d56bced934e319a1a41963e5e334d735aa465750e5999ce61c4ca46
font_02_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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