Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d3503bd0582fc1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 01:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 469237997b2a15a6c4575dd8e8a2efb6 SHA-1: 6f7e176b4fca49fd4d515e9e22517a8be7f8ff3e SHA-256: 47d3503bd0582fc1710f361d63eb4c7eb9c0aee526ab8e1a3ae59c8a6b0b90a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. Numerous external URLs are embedded within the PDF, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=samsung+s20+camera+vs+iphone+11+pro PDF link annotation
    • http://artospace.com/pics/file/20752925044.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/wavupez.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/zoxud.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/6747319542.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/92180322433.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210918200042207560mk6tyai0l116.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/19e5e33c1c68f02c9763eef1a129b194/11515061633.pdfIn PDF document text
    • http://15881588.com/ckupload/files/wunuforamivizipidadunofik.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/wazopulakazabafe.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/59078682934.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/35294757546.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/78783691975.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/57171924050.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/21424323373.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/51795929811.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/17583166483.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910050600325019.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/29825801561.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109120447029023.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/zilazigawo.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pawemuzo.pdfIn PDF document text
    • http://capital96.com/userfiles/file/rumovazanetisaxonodidogiv.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jubokiwesaso.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/84264239175.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vorupubedevopiperom.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/namijitowarosu.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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 17088 bytes
SHA-256: 94289d30377e146385c8dc44e218d190c877a148f7bd6999e4704f5f5a33b523
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 11212 bytes
SHA-256: a381b64743d5a6ab9770da8e1246294b69b0aa8b2acd7d012b7aca49715517b7