Malicious PDF — malware analysis report

Static analysis result for SHA-256 1708a76e6f7cc52d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 15:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc84bf13ae2536fe08bbe105e7fe2233 SHA-1: 462c3976852dc35682b9e2470441dbecb7f32724 SHA-256: 1708a76e6f7cc52d562a6c05604869dae8edde54902517524510d33bc23780cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm for phishing or malware distribution. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://avukatwebsitesi.kocgrafik.net/upload/files/lawasiduwanalu.pdf In PDF document text
    • https://dzido.pl/userfiles/file/88128635773.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/xevoxosoradituboma.pdfIn PDF document text
    • http://meditopthailand.com/file/wefubeminozerujura.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/22494768831.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/giwiresezivififidu.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/24145753880.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/37486339214.pdfIn PDF document text
    • http://sin-hua.org/userfiles/57212097950.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/22868889714.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/87922040899.pdfIn PDF document text
    • http://trubaopt.ru/content/file/vetuguxetezawewaxe.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/93671721626.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/gotuvaw.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/69460777521.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7a266c50---56827086169.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/64793265544.pdfIn PDF document text
    • http://clingac.com/d/files/64332619588.pdfIn PDF document text
    • http://teplospectr.ru/images/files/40419450917.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/podedumatar.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_FD0600FC25790580.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9fa59bc8f---17680877525.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/wiruted.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=play+home+doll+house+apkPDF 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_off0000ad43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD43 10568 bytes
SHA-256: 81b1010187e86a0d3678115c3ead2aa59ee74b30d8d15a7fe519d8b54b6010bf
font_01_sfnt_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 14536 bytes
SHA-256: cfc7d558e7ed63a2e373dd41d59da02ebc9370ec0f6a644751b16468489b8caf

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