Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f446f6b449f411…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 13:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61b243409a9378cf49cad25029ad1eb8 SHA-1: a57a676cd23b4ddfbe2765f322fdc047d3bbf0aa SHA-256: a4f446f6b449f411bb950398718cf6b27175a0e2ed1dafb99807d5b5902613dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to exploit vulnerabilities or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of JavaScript points to an attempt to execute code, potentially downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pixomot.ru/uplcv?utm_term=power+bi+download PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62b598e14c37b02314c6f96a380e5783/miriruwev.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911023115425.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/21506203410.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/44518614637.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/87295045443.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/widabisidepogolumupuxukuf.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/15285435174.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/gumekawavefap.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631534290.pdfIn PDF document text
    • http://placc.info/up_image/xiwus.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zatigoditerenukipoza.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/22941881599.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/30974217666.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/8631907949.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/85743954651.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/kifoxozugaxipure.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/10955082511.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109060052452304.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/juvodapuxezo.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/53233104821.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/65351773572.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/29724927104.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/46859403433.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/luvegamujazilazofisafebem.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65125347720.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_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 10200 bytes
SHA-256: a233319b86cfa50755ad760f673b7c5931bae0c4aaa062707ed6ba752484298b
font_01_sfnt_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 18360 bytes
SHA-256: 22b5e22629dc0c1c8a0815ef76de6b2b7bfb4dc9faf37fb9abcecb8800fec3f9
font_02_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1