Malicious PDF — malware analysis report

Static analysis result for SHA-256 507d8ad659a703e1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 12:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bbee2cf708fd84b3baf19e6eddb4e25 SHA-1: b706ab907f4e4707898ab30e2a1c62192e0fa4aa SHA-256: 507d8ad659a703e186e6bc329676b3f0e64d2338bc1ae67d7465e729d7c83bb4
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, and one prominent URL suggesting a lure for 'iOS app store download for Android'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=ios+app+store+download+for+android PDF link annotation
    • http://fatename.com/uploads/files/202109030227481622.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tojoxokubagitofokigivofin.pdfIn PDF document text
    • https://digireg.com/upload/98575240386.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/jizufaxuwe.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/rutek.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/8182493717.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/59888477392.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916172255567642.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lidagogupew.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8606479a---92838859561.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/34217490443.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/25547602799.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/jotojomumebidizijij.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jubamiwosidinabefeloga.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/16/file/20210916_162818_168.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///guwejuzituratamavu.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nogedefowadak.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zasadiwozusanozuwe.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/40871408703.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/78837069805.pdfIn PDF document text
    • https://adikkedua.com/contents/files/12303519893.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/faxumo.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/41256830104.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9e2c6a18---sirafakipamaba.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80730004810.pdfIn PDF document text
    • http://apsons.eu/files/file/49689392334.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 17480 bytes
SHA-256: cdd9da49c37c146416073c63b15f29196d7f173eff4034396f58f8319acfbed7
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10528 bytes
SHA-256: b6b0de1f1378334f4088907cd2598d10e06d5105d044f7c8be697ce272a48cf1