Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08e088e8251a724…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 09:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d5994e06963521b8fc5271447c145fe SHA-1: 40473357f98bc74b143a33f8c73a6f4cc4a5c152 SHA-256: c08e088e8251a7241207265d37b7b2670f0f1d44dbf4c5c1a4b5fb904c527ed3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aunay-sous-auneau.fr/ckfinder/userfiles/files/49511691346.pdf In PDF document text
    • http://fireprovietnam.net/luutru/files/notufipopesowefove.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/64036743869.pdfIn PDF document text
    • http://tradotel-riviera.com/file/togixedobupam.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/99975687571.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/35934624556.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/rorafagepaxakusu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b0bd5660---tupomazejup.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///80935050208.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/94826181472.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/buniwogurerid.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/viwaxenexoxulix.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/52721292049.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/momepukidipi.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/4064446965.pdfIn PDF document text
    • http://bociany.sk/media/file/77153298556.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/masapo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091211012273499.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210906055056.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jibedumikawekuxaninofapu.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/4242897312.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/nabixarovekalejiduduvob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+9+pro+vs+moto+g9+powerPDF link annotation
    • https://easyown.ddproperty.com/datas/files/suvaw.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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 10892 bytes
SHA-256: de2c931b24f063db40e19444df3b3921e59576485c735b59baa3c8a3bf63ff49
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 17512 bytes
SHA-256: bde47859638d82d8caf7c86b5ed8277c14781d8d8aeb75362270bf95d37e2d46
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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