Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67d691df5987563…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 01:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 976d762de0d34ea42981e4afc73ed402 SHA-1: 5792ec3b4c7132ddc8e7ce044cfc37211312eb65 SHA-256: b67d691df5987563b785b4a441f58cc9d0c4a584a4ed0ed4b015e4d9998c3f7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or SEO manipulation scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://8njl.com/userfiles/files/wogodapasibumidizumixa.pdf In PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/xagabifiruvip.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac446b9f4---pukemavivugezezazenuzop.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/59747289646.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/bidozamekotejibolurivoga.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3c996a13---rotejokawufagatevuxo.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/tufikutajupa.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/32798751540.pdfIn PDF document text
    • http://schokozentrale.de/idata/jedoberavifol.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/saworetun.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/61470883767.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/14973653523.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/1261216411.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/buvojup.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/nivokawu.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/kifimonaniromun.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/ladeja.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/2667885739.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/1378016635.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210910_DD246AB4F84C0AF0.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/ropapevurudo.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/30754604957.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/gedixemafivip.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/rewakexufozuruwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+chronicles+of+narnia+the+silver+chair+pdfPDF 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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 17328 bytes
SHA-256: bd4500e033efc63fb4f1411164413d56dabd11548771c6e3f9af2cfb2c6246ef
font_02_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 10748 bytes
SHA-256: 256d45399c30b75a26fafa79debd66650ea402867e8673c023d49ba123b0e763