Malicious PDF — malware analysis report

Static analysis result for SHA-256 17586a8921e0c1f4…

MALICIOUS

PDF

77.4 KB Created: 2021-10-07 01:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4fb75fac9b6fe34ef3d1086fceb32421 SHA-1: 6cc619010a56d1c0dc04921db1615cc8320e5945 SHA-256: 17586a8921e0c1f44ef63d542029c9a6b9ee012c35558a2729dc4c1d804e038a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for SEO poisoning or distributing malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://millinerandassoc.com/files/file/22739379748.pdf In PDF document text
    • http://flagrant-desir.com/userfiles/file/tuperuv.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/vokuju.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/59980277519.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/96769546567.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/mazerujimezudilama.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wusugeposuwodajo.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/97661186617.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/21528438455.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/xikipavaloxenuzutot.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/18248580283.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/vizenutiwexetonidefigube.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/bilowulefupotogo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515b154185---wufabobukivanexifi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/41305771173.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e215434c7---92520476295.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/56443262895.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/musaxiku.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/sikugonevik.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/54620447243.pdfIn PDF document text
    • http://khocabien.com/uploads/files/nakuxov.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/sitetarevuxezurexamur.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/wozalakewixuki.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/90834921548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+manual+transaxle+fluidPDF 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 10692 bytes
SHA-256: c629da8d5e0298a44733f8aff21dafd9062e177d44251ced6abe8dfb0484aac1
font_01_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 16884 bytes
SHA-256: 07eebc85c0549cff5f04acc1cb42a28f4d29023d55b10686f49b5c123146b9f9
font_02_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1