Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dd5f1d8dff8c6f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 21:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e5862b0b363417791c8f12d8561cbf6 SHA-1: 5252bafa3df4dd98383a1804f1be500668c34ea7 SHA-256: 54dd5f1d8dff8c6f1a1b3e31202f1579c88461518c9aa377ee1ff7d443554a51
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, suggesting it aims to trick users into contacting malicious actors via phone. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seerupit.dk/assens/file/xafufepixejesigunexomesej.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1f4d3ce6---vipakajatavu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/65432551498.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/klp5k1mdbtvtl2sf4f28d25tmr/51688781034.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/lafapowomutasowil.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/rufosoje.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/67600815762.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/vuxowekudabusumori.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rowaxolepunoxobop.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majojogotejikutulesam.pdfIn PDF document text
    • http://acelybio.com/upload/files/vovodubezugovesip.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/tatelinewaxi.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/70519591529.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/rajurepujunimatusewibipa.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/72079805758.pdfIn PDF document text
    • https://31app.com/userfiles/file/13759633536.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/94045976743.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kaxot.pdfIn PDF document text
    • http://irinabailey.com/upload/files/xojatatos.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/tiwoxipa.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/8015091415.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///89648322172.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/33656919667.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tuwov.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+fear+the+walking+dead+season+6+episode+1+online+freePDF 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_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 11292 bytes
SHA-256: a41315e293a7580f56af6c2f4ef369053ca2accddba1c8984a7160c70ac80156
font_01_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 17104 bytes
SHA-256: e072d0c9e2fb04b5d8dcb185d5cb467cc95b2c73a4a6bc885e3955a1e8e3ee87