Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68083abce0af279…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 19:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c88c4623a777eacda4feebbdda10746e SHA-1: e3ede005cf0e8b4e25fd94a38f533fde8d2c7401 SHA-256: c68083abce0af279079003bd46e7f8c70fabbcd185f1fc037a9f111e28c24313
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous external URLs, some of which are hosted on potentially disposable domains. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shturnev.com/files/foFKED/file/xenisesonazibitesavika.pdf In PDF document text
    • http://tmtechvn.com/webroot/img/files/22487911264.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/89473159744.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/laloriv.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/99641741816.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nenunazaw.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/jalijemasideg.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/mapukijeromavepib.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/2525241001.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tadodafatisutisopi.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/kapopilaxe.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/muwowiraxa.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/xuwifuzalum.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/39527778056.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jatuxusesowibebid.pdfIn PDF document text
    • http://sartor.ru/upload/files/tomazidoboxaxe.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/92645811541.pdfIn PDF document text
    • http://iscelenie.info/files/file/50907532009.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridexijurowo.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/xexovevefowoza.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/50309679246.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/nogamixaxidifolexilobi.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/88474327904.pdfIn PDF document text
    • http://knipia.com/userfiles/file/geronotobolelewefiv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613cceb1523fd---febafupibe.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/68016544275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+pubg+apkPDF 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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 10396 bytes
SHA-256: c61c09b4852c8430f489f106ff085202aa6fc2d2cb6450433abbb29373a5a306
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 18612 bytes
SHA-256: d7a376921cef8f29592f2a5e54e07c9c8fde57d082d2f90547161e890e27cc18