Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3797589209956e…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 17:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b985ba94f09a092bf980574ef5e72445 SHA-1: eed634d520f1f387b257fe210843d93ea0dd07d2 SHA-256: 2f3797589209956e74f27d1413a7b931f031a107be1e5626b3a3ab369bc74954
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=types+of+jazz+songs PDF link annotation
    • https://yakin-surewin.com/media/file/ratek.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161385c7a83ca7---61492158322.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/70482240375.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xojepatanewiriso.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/91620944347.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/wigenu.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/fogurazunepitirofama.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/45631429945.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/99310047966.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210925_4148BBFA5AD82734.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/kopunaruvosuwetatasijo.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/24431120134.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/wunutopowejevewe.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/nufejilet.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jexulefen.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/famewadubizepiratirowur.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/dukadevaniweronoge.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/xalolodizakewimukevin.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/satejuzigugezupujipe.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/zelukoxonewuva.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/26704080323.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/kamukomawimop.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_off0000b08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 10464 bytes
SHA-256: 66c038b0d3c6bca2f9cb0ef98c1728d579be27a6cf328e1891bae0cc276e420c
font_01_sfnt_off0000c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88D 16288 bytes
SHA-256: 52ea4a0a20de68e6482cb5b78a5af392f8dfd14b9f3b962a0490e09106000cc8
font_02_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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