Malicious PDF — malware analysis report

Static analysis result for SHA-256 76738dff2813f0dd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 05:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08282b5f0cb440b4445c6adc9091bc99 SHA-1: 4ba2dead73aff48c19687c64546ebfec43cb3989 SHA-256: 76738dff2813f0ddf40c1bc366d81c9bc6002871e2803d81eb87c4336a109153
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is often used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature, pointing towards a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://nelly-design.ru/upload/files/jibazogobixupazenunixex.pdf In PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/56418574119.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/35216406998.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/28065402803.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319bf52e3c8---xosalaroviwifi.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/22619882340.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/18475548025.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/95732993602.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/91373586334.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/82463020128.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/93685608138.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/20c7ee2f2fd464bc632239635efa7ef8/rijedo.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/mifutuwapuletapikeduge.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/zeporufetupubaposoje.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/xojebaxatilamibevukemimoz.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090521095583.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/52740797406.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/zajunalafuwat.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/3968347739.pdfIn PDF document text
    • http://zeci.nl/im/image/jejokawego.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/rasalipixaxujidonuxen.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/50847452331.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/76264638205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=application+android+course+%C3%A0+piedPDF 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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 10772 bytes
SHA-256: eb21df04cf043fa7f7585de473a5546a6feac3cb2646162778995f28ad98e6bb
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 19396 bytes
SHA-256: 41b50bb27ff676a2ba0cbe7ad6db1a28bc3f4108fb544174acd4fb8fe461b7ac
font_02_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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