Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c3aa8194c5b18d…

MALICIOUS

PDF

118.0 KB Created: 2021-09-12 10:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a9e87ecbac7aa9951127a0ef3eb1d28 SHA-1: d6b877c8ed38d756488d6e2da23eee9791d9d1eb SHA-256: c4c3aa8194c5b18d78e386dacae6d34ba324872da6e11b9e18eeaed7dc310727
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to compromised or 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://drafthe.ru/uplcv?utm_term=success+to+ielts+book+pdf+download PDF link annotation
    • http://inarchengineering.it/userfiles/files/xasakenelukuvunu.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/9200586159.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/373327216.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0f9e9c197a97ab6de3457837d46b83fd/guveni.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/satopebok.pdfIn PDF document text
    • http://scsychem.com/upload/files/44036739402.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vedagedalisagerezokori.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/14985931851.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gezigofarubizatopajaxi.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/25600444679.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/95080615553.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jasag.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/15987099343.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/90669718167.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/66865884475.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/17567627573.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb61ad64dc---vukozusabaluk.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/97719842912.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/52056374957.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/2125156302.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/50991868135.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/veriwipepaviduxor.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/9771212349.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/22264279758.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_off000164e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E0 20016 bytes
SHA-256: c8063d5709c0d3e254ba717ff12192bf48c7ef3b9e3f4183836162e7d4b8dc1c
font_01_sfnt_off0001987c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1987C 11004 bytes
SHA-256: 92646ed78468e468e28e4e30a509d251f5ea4b9085dfedb8a541f466f2646a8d
font_02_sfnt_off0001b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1