Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdda6222f638ce6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 04:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edc695c15ef7c337e71e673643837733 SHA-1: e04874806151dd66899c588b02a56e3537565d20 SHA-256: bcdda6222f638ce68a8e7ce63c72b915c102e6f9633f652187f53f58aef17ad7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful websites. The PDF structure and embedded links are consistent with phishing campaigns that use malicious documents as an initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=app+buat+video+di+android PDF link annotation
    • https://mfdesign.hu/files/file/sefekepokakaxoxipotu.pdfIn PDF document text
    • http://cabini.it/userfiles/files/93639276546.pdfIn PDF document text
    • https://bataretak.com/img/files/file/16174877623.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/dilipurexukusafuvo.pdfIn PDF document text
    • http://sial.pl/galeria/file/bakamawonilukesofoge.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/resuvogurejef.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/97723158172.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/57760963162.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sefilitanivalimit.pdfIn PDF document text
    • https://europartner2.pl/uploads/nalajaputuze.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/mivowalodexusadojigupaj.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/78239872505.pdfIn PDF document text
    • http://nanopena.cz/upload/file/wumisigeleroxelexefefogiz.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gujarokosopirazonaleg.pdfIn PDF document text
    • http://darec.sk/files/files/tedosetepegipenelidowokem.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/xakepekab.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/padavize.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/98178772.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/pikodixodidagepi.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/51609031893.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88717382848.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/95891981106.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/bibizurabunu.pdfIn PDF document text
    • http://akademibt.com/resimler/files/xenuxevu.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/towewesurejut.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/bakagapisujix.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 17576 bytes
SHA-256: 93057638176678a92f66ab16928e9ef15aa1ab9924efbbfd679e124677e605fd
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10456 bytes
SHA-256: 18637e405077d031e99352235b1f53524dac0c269a0c3adc05aa4f9e40a9afe2
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1