Malicious PDF — malware analysis report

Static analysis result for SHA-256 f738d5b732617323…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 23:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49ce1ae41167f53a83d2254e7ebc956e SHA-1: 15b7519395a580b992291cf146beff16af3c9555 SHA-256: f738d5b73261732350633b306bb72f7f428ef98fd08985c2665f829ddd52d74b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=how+to+download+image+from+ig PDF link annotation
    • https://biogenetixpharma.com/ci/userfiles/files/96304683325.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/2083909096.pdfIn PDF document text
    • https://tdfstore.it/file/wizifewug.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/nawujosirago.pdfIn PDF document text
    • https://menu2uplus.com/images/file/77527259517.pdfIn PDF document text
    • https://csodamalom.hu/files/files/79256817694.pdfIn PDF document text
    • http://etkenkalip.com/files/sujatiwovazajazaxib.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/780093fe139b064135c77e846ab6cd63/74123503408.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/49rg786ft594i3s6djho9umo34/41030589550.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/78252505760.pdfIn PDF document text
    • http://dytac.hk/userfiles/dulisekewav.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/kirevopufikile.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/35326756313.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/21927426355.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/96425955904.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/83799530264.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/gokeketeze.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/sepobow.pdfIn PDF document text
    • https://siroyensao.com/upload/files/futexidafogulumo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/xopewukuzotegu.pdfIn PDF document text
    • https://insp.biz/img/file/sazopugepuwifevuboro.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/34747279383.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/79894750678.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 18900 bytes
SHA-256: cff80b5a64ca15af0b21ee67e6e08be017f5c0fd8af16341d1fc2457230e79b7
font_01_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 10608 bytes
SHA-256: 71d8763f54596aecf8b4e664f7fc06794fa9bbda552bfba057cf2f36d6c55b95

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