Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1590fa133be9ca…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 18:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30478e4ab2afdd79d61bc8af65b0ee60 SHA-1: d9d21a2a0807ef3ed9c101832f12c3eebb0d7e77 SHA-256: 6e1590fa133be9ca4865349c42f678e0db76ca1c958020ed07c12c23acca7a3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The presence of numerous external URLs, many hosted on disposable domains and configured as link farms, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the heuristics point to an attempt to redirect users to malicious 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://coretry.ru/uplcv?utm_term=health+apps+for+android PDF link annotation
    • http://evrokomplekt.ru/userfiles/file/35795639855.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909231629.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/tavagitiminafewizejak.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/85508093303.pdfIn PDF document text
    • http://aimic.com/userfiles/file/95364087869.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/72229213115.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85004431721.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/71394140006.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/metifosunu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/43623249910.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nefez.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fejor.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/madawudavinutemim.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/rapifod.pdfIn PDF document text
    • http://malifer.hu/upload/file/refawudosiriroganuwi.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109022216259862.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/97970376254.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/dazibusefe.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/28991199688.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/98354109325.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/64534715584.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/82198293498.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/dafuworepepujojeza.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/bufakujejajanerujolatib.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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 17168 bytes
SHA-256: 30edc0f0076d8d0ad17c5a206d944cffe8f54618399826077b3e0841557b8be0
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 10588 bytes
SHA-256: c585bcadc5b275fb16ea8a0b2ea1bffc75fc6b9dbb27feaf1a2ee215ed956bbf
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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