Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0ef37ccfd12daf…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 19:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33e884cee10f45a71e1e57f7de802b39 SHA-1: 0e4aab57a4d12cd9086fd5d427806e1f18958552 SHA-256: 9f0ef37ccfd12daf6fbf3747deac1568e337428e000f0a3e9103da8269f6c6c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The presence of an embedded JavaScript stream further supports the malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=cheap+android+app+development PDF link annotation
    • http://liderzy.natura2000.pl/imgturysta/files/81757589122.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/89570125512.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/bijojarefitibamuzawo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/98216235233.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sebokapabavigej.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/50424918927.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac79425276---gowise.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/22001345527.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/saxasax.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/gavoziso.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/64261826464.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/80072828170.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/zanawikije.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/45446376170.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/67371144628.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/1iv20hl6qdes11qluh6c8gr97c/75097501939.pdfIn PDF document text
    • http://uteambio.com/upload/files/23466075053.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/kabuxisufozimolizidekawo.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/sinuzabavixawese.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/84654577435.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/sorurekekubakuriwoxe.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/13030529714.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/noridokufo.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 17228 bytes
SHA-256: a59d3cde9d0b6eef9bf1bcc56090f69c2094b0a7daddab3bcfd73444dc86799b
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 10588 bytes
SHA-256: 718059cfbbdefd2dda645c134e898a98858e15fd0d3e0b5fbc303dd115e8ab82

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