Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c39f968e4fd80…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 02:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72fea5e73f7ed1538983f7f65b440660 SHA-1: 317d38a178e2f360cef4a36901cc0132957b2c34 SHA-256: ab1c39f968e4fd80d9b6055b8014dec2f94f19575bfded6cb0452b3517af9fe3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It is designed as an image-only document with a hidden clickable action, a common tactic to deceive users into downloading further malicious content. The document body is heavily obfuscated and contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm used to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nguyenphat.com/public/default/ckeditor/files/70589911585.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6266a6dab15a9e290c9e608cf50903f2/luxade.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/dopobivikobesirozani.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/safopirewafoma.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/takuvetemajazitunofosib.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gazofu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/foxejuremunutidovetixudo.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/50363030590.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/10428439392.pdfIn PDF document text
    • http://boldogelet.hu/media/95166955879.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/39454507472.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://godahoian.com/app/webroot/upload/files/38356789052.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/sufabuzanivaka.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/kufagos.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/zodofod.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xuwigelawo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab321c843---niropufirojaz.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/57379439829.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/gumitu.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/1d574647d5978f282abf18ec5d96a669.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/munogarul.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/30987468514.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/togunatakimus.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/65707982235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+stock+recovery+image+downloadPDF 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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 11052 bytes
SHA-256: 21146f125378d3a38dbed306e7ceabbb3e31390421a44fc3cb93ab95d7363cd3
font_02_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 14060 bytes
SHA-256: c9e8a5ef39a0c3b1b922883780d69006db60e5e52ab7120dba8c69a310b0db3f