Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23e525262811472…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 03:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd6e9466cc1f7d1d606cb5e554ee131f SHA-1: f569136546d0d05ce28919dd0d59ce8cd9edbce5 SHA-256: b23e5252628114729d59cd6a4cdc6869153d7f53427cd0dad7ff3b6ef6616abd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to obscure the final destination or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vatlieulamnha.com/media/ftp/file/mogikafidawam.pdf In PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/46368404561.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905055653.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/67306996404.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/6295458614.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/69813939873.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/79022950674.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210918094729.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/17955690158.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/tipazope.pdfIn PDF document text
    • http://temple.mo/userfiles/file/62453070339.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/92084889167.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bd030aeba64b131413ebfe451b80ef4e/55697819133.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/jijilekisabijedaxadogoko.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/dufoninunuwav.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/palaxunokeziwogebaj.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/kanitabisowasumidesogemid.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/37473270157.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/duxasurijev.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/chf1kusemlcbtd4juhoju3g995/64249591197.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/witigobi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/lazemonefaf.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/30132531119.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/44616109303.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/91157487022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+science+and+engineering+of+materials+solution+manualPDF 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_off0000b584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB584 15396 bytes
SHA-256: c758d7b09a0a36ea85f5cc63c7e2e09956b9ea05a0ec56562a200d48ba97eee7
font_01_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 10984 bytes
SHA-256: e53137f967fc9f525fabfc1a6213244960ece0cc1ecbb2d860af7af251347339
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1