Malicious PDF — malware analysis report

Static analysis result for SHA-256 3203b7587e8727fa…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 06:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eeed125cbd6d81211cb5e1ee442c9d0a SHA-1: e7c0d8c13c6f05bacd73f3ea53ca8b342de27737 SHA-256: 3203b7587e8727fa9c09596bcff8e788b1eebce643307586d57000746d2fb9b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=dua+against+sickness PDF link annotation
    • http://lakesnwoodskerala.com/uploads/file/lotarezizarigijaro.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_5640A00F3FDC8089.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/sasamotilonogexewotuv.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/lijabizafugulemelixow.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/valubasadojewawofikirewod.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/miziwokumunoxexeri.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161353e703ac59---pizuwiwapose.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/bematamodipukuxije.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/ruwafidupavotinasupogog.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/dimuzoviw.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/26494723937.pdfIn PDF document text
    • http://dezis.ru/uploads/files/84498000036.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210901131427.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/66812427402.pdfIn PDF document text
    • https://ip-pharma.net/data/files/pazofilixotamivunikol.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zobilajowezogazudaju.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/rugoselotezimo.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/21590195364.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/zoxogibavufe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e855cbb8---79065206746.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/jixujepaz.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/46573668506.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sotedisiwug.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/9462723763.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_off0000bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 10332 bytes
SHA-256: 7c20107e3a01a2b18d0d8a0378c62347f871ae745e13d490e37225cb36a2ec97
font_01_sfnt_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 19440 bytes
SHA-256: d3a42a1e9d68e5682e732d9201086c6d8e7e116be6886ecc07fd27ad89d6df17