Malicious PDF — malware analysis report

Static analysis result for SHA-256 2141250a4482f161…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 18:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6804e9815cdee7539c0aeb5ed398e0b SHA-1: 135a9a6ffbecbc2337cffc573a7c277f61469f9c SHA-256: 2141250a4482f161411a0b6ccb1d815127b82d7ab252873420071c22e2bc2bea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many pointing to unknown domains, suggesting a phishing or spamming campaign. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1833001d---vajujoranubanuxas.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907084915363229.pdfIn PDF document text
    • https://bfull.ru/uploads/files/14193448450.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/56635160467.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zerowutajir.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/84442565367.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/31511842720.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vexofex.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/wuwasuwoga.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd8eb5f9f---39663374278.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/rejiwisiworiguradidofu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gevotazofamudovavagutar.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/newinipekupelulena.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/famabu.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/dulunawuwepugazalorav.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195158214931.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/jebuw.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/putepotugewefiva.pdfIn PDF document text
    • http://pnalog.ru/images/file/xujur.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/92787962104.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/jatiro.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39283658789.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/50031804672.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/taretujekufedatujede.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/41602343618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=linking+words+research+paperPDF 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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 16860 bytes
SHA-256: 54be981b046bb4ed89b79f0713f496697c588a0a02e61e3378c1d1e3ad6236f8
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10784 bytes
SHA-256: b6489d444f07d09cf2b86a97da90ca69dfc877252d0199ab2d93651be78bc348