Malicious PDF — malware analysis report

Static analysis result for SHA-256 578de70f4b0858b2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 14:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ae3561971f1f52161deadb5a8111ae7 SHA-1: 546b45b9b1b8fac4bb2303908cd7470227b588e3 SHA-256: 578de70f4b0858b28dd3fa08589108933295e5f1c5bd54577ac5c473f0a03344
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on disposable domains. This suggests a campaign to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://csc0516.com/userfiles/file/20210916105702_75kuwp.pdf In PDF document text
    • http://titadoorbinhduong.com/upload/files/99367737035.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rg2ipkkuikn44khmc4cg2fgv8b/fifola.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/66744753314.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/wunorur.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/tababipivegebusefuluwoza.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/peboxaximanimagaloxezejo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/latuw.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/74623299469.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/wagajowufefede.pdfIn PDF document text
    • http://potlista.com/file/files/najegerijosogatoze.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/vosit.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/nokilubodog.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/gapunalorurelilugobum.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/92812830733.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/tirotodurulifagopebogudav.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a7f7afd49f08cd798b347857975c3d12/woxowizofax.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/wadopureluveb.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/gukutujete.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/85831926149.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/bikemiwaralaxomasugovuxuz.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/daxitituzunowuxogi.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cheat+codes+for+gta+3+mobilePDF 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_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 11160 bytes
SHA-256: 61adc52933f75ff7993684e67694dd747dbe1ae030bae33ecc2fb268785496a3
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 18260 bytes
SHA-256: a10953b5ff04d0e6e0701257c3c3f6fae05c5a5a6440da2a2e87dd25382a7483
font_02_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1