Malicious PDF — malware analysis report

Static analysis result for SHA-256 adff4c6a790c8844…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 07:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42b2a2feda38d3ead7530da99a7a28d1 SHA-1: 2fa425e22d3cae26ee5258a77b193976752c8b15 SHA-256: adff4c6a790c8844d365333efdf9f8a0d0cb83d4996696b254750fa2a854a647
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to disposable hosting. The PDF structure and embedded content suggest it is designed to redirect users to a network of sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nationshield.ae/userfiles/files/33609953766.pdf In PDF document text
    • http://csc010.com/userfiles/file/20210901082427_y1rhik.pdfIn PDF document text
    • http://bankerz.in/qpic/files/pugefakosidudinudiru.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/31620854913.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/22506911192.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/genozotijojusitotil.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/82820681871.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/bupabopeloxadobe.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/lilesot.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/juxevox.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kidoxufabiduzunezogepe.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/87526449944.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/bopolokekigasesar.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/pamupivu.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/67190134383.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/ribewujere.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f061d080---nezipuwejejuvofatuwopero.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/81833098449.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/62360221329.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/womowokirifupujejino.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/ganaj.pdfIn PDF document text
    • http://agavietnam.com/img/files/77794478752.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/76596128415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=funny+valentines+day+memes+for+singlesPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 10952 bytes
SHA-256: dbba7b7ad3bce0a3cdd6eb5f39fff13c4515643702808d1c7a901b8390eebdbc
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 17852 bytes
SHA-256: 9b25321fbac9c344c8ae5797a4def8d1a1c9bdd4d0ece8f2059a4ed5f00c1142
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1