Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8a6743509242af…

MALICIOUS

PDF

86.7 KB Created: 2021-10-10 11:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb7a6ab8a92875dba2011dad04d2cf6d SHA-1: c9194bd9a2697c38b4f75176da50cdc4b3337bc0 SHA-256: 5d8a6743509242af839f7efdd7f768bdd369f87e7f2ee3c007f49df6963760f9
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, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.velkoobchod-man.eu/ckfinder/userfiles/files/lowunega.pdf In PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/19139965095.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/tekosupaminojopevuzibana.pdfIn PDF document text
    • http://glttek.com/userfiles/file/14016693095.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021926_144825_475.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/rurimajerudutoselilivu.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nisarureni.pdfIn PDF document text
    • https://trainova.com/userfiles/file/83331729240.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/40577228760.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/dowuvexe.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/47067728833.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/xuxepatimudawomun.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/13290471227.pdfIn PDF document text
    • http://bptramptour.pl/files/file/82312405113.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/51696787596.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/92333702081.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/69246372405.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/kidadirex.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/nemoseverixijowuvunigi.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/15717483753.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/44rl2kovcg0uv6ncrkv9ongrj1/52298468050.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/26811320223.pdfIn PDF document text
    • http://linza-market.ru/upload/files/gozokaviwopedog.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210922/files/20210922192417.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/pixusemaziko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=concealed+carry+permits+by+statePDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/58295988051.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_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 10960 bytes
SHA-256: 011b1f7e8fee48acd41fc7f4a9af918c35df28c4c393112fd80461f01e486d81
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 18820 bytes
SHA-256: cee434c793c9d3a1425b6905b17d0dffa03ea79a69d07c24c075f696f62e60d5
font_02_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1