Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b24cff0f7e8bd2f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 06:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afcee3ea0024318519d193db98ff652a SHA-1: f3bbb66a92cac2b3278e553e9c6a3dbfcb20a54c SHA-256: 6b24cff0f7e8bd2f1125e6fcdbc74897e328914286a17a0a281ff8a974fd7de7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The 'Fake invoice / payment lure' heuristic further supports the attack pattern of social engineering users through deceptive document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://synerhu.ru/uplcv?utm_term=cash+flow+para+android PDF link annotation
    • https://loyalangkorapartment.com/userfiles/file/zomasuzuzotivepem.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/97326228960.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/20012848718.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/jalidafaweguko.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/61834861293.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/30220108661.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/ludinugodupubuzuzosodi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/79986099266.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/nepamabulepis.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090513195473499.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/65171585898.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/womipanufatili.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/3642672843.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/15680253754.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/zevipam.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/88399624566.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nizototaxuvenofotufofile.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/vimefiwo.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/54004108737.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/50815762378.pdfIn PDF document text
    • https://irantruck.ir/data/file/perus.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613969fb14c6f---98095983617.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/dogoge.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/rosepawew.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/vopovumiziloxowote.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bidaduperirufefu.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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10480 bytes
SHA-256: c585a4f103f3d05a6a7eb167e1da9868ba0a027682f51db74d6cf1a0fa7ae4fd
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 17516 bytes
SHA-256: f4aca80be0db13a44c91169ff4b8e9dd0e240bdba3d8c80d55009dc8ae9df0ff