Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31f9f63001a618f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 16:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f374cacafadbdb3aaf5e5395130e4cc SHA-1: 333b855a149241f22e95b2167fde50dd129d2e15 SHA-256: c31f9f63001a618ff1ccb5258e82ecaa17f997ce93f484e62a74278c534185ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=how+to+export+jpg+to+pdf PDF link annotation
    • http://worldtile.net/jangheung/userfiles/file/nazev.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/dc189b3a3d2121998e54432a3e7836f4/81029274424.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/tebovivij.pdfIn PDF document text
    • http://tianfonmm.com/d/files/56006776834.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/vosopujejibuzosufena.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/49116064742.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/mekon.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ip8s74m6g7avb0skvi92fgu7je/46024583291.pdfIn PDF document text
    • http://cabini.it/userfiles/files/wixitufululob.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fepamorunukikurijuditipe.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/5197668616.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/94688271870.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/nemumarudadu.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/putetipixarabuxov.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/wavedetanebegenagovonud.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/wewuriwopo.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/554180695.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zamebi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905005840310219.pdfIn PDF document text
    • http://prestopc.it/upload/file/xovuneva.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kudopulosefajok.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/18880277824.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/zojenubunezulixen.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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 10412 bytes
SHA-256: 47eab2a486e9a6caf4c3db90398cd466585d65b3daf21cb27ecce08686b18025
font_01_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 16308 bytes
SHA-256: 095933f3d3bed6c821b6481d7139019f0d3bca7c31cb672feac6400170ce061b
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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