Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eda51f72e87096…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 13:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d88cb57f3d9c521c4d910ad7dfa9922 SHA-1: 5261c21f9b22e5d0425992b2e5dd76cf8240b6f5 SHA-256: 25eda51f72e8709681c350504543e44b379d4d35381ed348cb81644cba6ba0ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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://whiteplacard.com/UserFiles/file/sudik.pdf In PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/nuboresixotulorop.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/84320170084.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210908072226.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gibebevoretixewulaguzu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/memedogeludob.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xulibamimosobigonefuz.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99111943214.pdfIn PDF document text
    • https://limsurempat.com/contents/files/favovivudofelo.pdfIn PDF document text
    • http://strandedtattoo.com/file/bisomilivomazosimulorekaw.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613763f38c2cb---19875141229.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/12996344189.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/vagubuzedoxub.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/vibepar.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/77551745352.pdfIn PDF document text
    • http://iknow.pl/files/file/vomopoga.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/muwutirafixikapab.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/momevedofenofajurivis.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/gikonikodujufuvuxej.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161382efca392b---kuvugagagoxezugisififik.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/dabutabobijomaroz.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/galovekoromufopatem.pdfIn PDF document text
    • http://usateatop.com/_upload/files/79592316221.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/030137183383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=123movies+2021+free+moviesPDF link annotation
    • 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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 18916 bytes
SHA-256: 6579313df9d3c0cb728893caf5dcf7c54cffc94236fb4514b970addbcffaff8f
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 10400 bytes
SHA-256: 80d9934527af8b33c85285de6f3300c48a91ba67849685267d41f77bf8942be4

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