Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc1a1c2c37f4fd7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 19:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd392a01f2b6d312856efa622bd71fa2 SHA-1: a2bf3716b6ae22279d23d54c81b48e925f9bfc1d SHA-256: 0fc1a1c2c37f4fd784fca690c90f5c398047c34e8e2a892747b327e4b8fdfce8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=site+to+stream+live+match PDF link annotation
    • http://rogersdesignhouse.com/uploads/files/60687842317.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/69181204261.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109170416168762.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/4333865655.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/bogewex.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/9803633607.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1quk8qit6p6o3f5epms5m9fues/93270671173.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/padosovoxalapidokutifame.pdfIn PDF document text
    • https://wecareprogram.org/images/file/20093571874.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/masemimupereg.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/gekisubefut.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lojav.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/76717286776.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/51762998584.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/buvobujesumoxegunot.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/mifogefatisejex.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/32765393632.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/jitonizukotutukojaxe.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/solidajozome.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/72136228157.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/12317942793.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/8715467627.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c302ec768c---9755780468.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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 17996 bytes
SHA-256: 700fd6286d76e64387bcd8fb77cfb3490c1fe5595123efcefb775c016a32b5ab
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 10532 bytes
SHA-256: 32991590a98075c0abe339103a3cc881842ae29a68c2ca8025049c3e4f63f9a3