Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82f170edfee6348…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 23:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a717ff8d6010bb8b3bd04e3665de2dda SHA-1: f364508a45fc3789730e6351c419fa9d38b74e0c SHA-256: e82f170edfee634850b451edd3788abfd544d33266ceddff8bf21c32de280157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lulanjina.net/upload/files/jiwiduzojejugowaxevusuji.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd1cc83b7---nozumujotipamepurupolinob.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/69529488927.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/54418187947.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/panib.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed061dba9---vazumaxefigojagopux.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/firupekex.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/62994020587.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/42921180292.pdfIn PDF document text
    • http://seamacros.com/upload/file/31106118681.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenubokepigezis.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/giken.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kozigobawiresepe.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/94032901965.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/wedewulefaxatajeket.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/24724065224.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/39961221264.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/natepubatugujijobep.pdfIn PDF document text
    • https://maviet.vn/upload/files/sijuguwoverowi.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/kefunetaxi.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/bavuvi.pdfIn PDF document text
    • http://cloverdiamond.com/file/fopulejodeb.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/juresimimesogiledijesor.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/jidajerukimusevezodaxe.pdfIn PDF document text
    • https://bfull.ru/uploads/files/455765181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=see+posts+of+private+account+in+instagramPDF 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_off0000c75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16640 bytes
SHA-256: 105c2a40442e408dad37158f70532ab179641ce18a55713ab88481f46ed5ba42
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 11020 bytes
SHA-256: bc59bf30a2e965aac3edc5408cd301c3981ef96c65e8d6c928d34205c3a03563