Malicious PDF — malware analysis report

Static analysis result for SHA-256 502dbef63f85e7e1…

MALICIOUS

PDF

93.8 KB Created: 2021-03-04 01:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f79c5a112f8d2f9eb12d78171b1d7a28 SHA-1: 57782c928a8279fb81434f87595f2ce3a5ef51ba SHA-256: 502dbef63f85e7e1b041bf602756c94509ec2f2aa839d28d1a6f58d2c37dea44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one flagged as a link farm on disposable hosting, suggests an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=descargar+mix+de+anthony+santos+viejas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387411/normal_5fed01c34a518.pdfIn PDF document text
    • http://dovazevenujo.22web.org/second_hand_law_textbooks_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_600b34d64358c.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/Gdijhbz/senire.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/1icific/kukazew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff2641363db5.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/ii5ibV8/velodobanav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_6039eed9a6af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60216afae6d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60106731e0ba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_601236f214249.pdfIn PDF document text
    • http://sisaratu.iblogger.org/94179064510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesaratesur.epizy.com/gukoxuji.pdfIn PDF document text
    • http://gizexagivet.rf.gd/how_to_stretch_your_thigh_muscles_when_sore.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/code_lyoko_theme_song_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/19900337950.pdfIn PDF document text
    • http://nawupewiviziwik.rf.gd/wubibisibilokasu.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/kadawonixemaferud.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 5628 bytes
SHA-256: 854aa652ec9835339badc9b7fa7b982ff52ab3c22a06e6b58b8fdb4122bf0762
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 11080 bytes
SHA-256: 994ec00658b5d7dcfd7ef0fe0e79dd9bc68f550e81ef483eb0cb6ea4b0aa57fc
font_03_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 11620 bytes
SHA-256: de992d557148dca71193a2ad7a0f3bbd90c58d8357cc27a43924d836b5828b8e
font_04_sfnt_off00015117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15117 17312 bytes
SHA-256: a813afede87d0ad5bb0ea00de816c2617bb6d6b84cf88219f4bdde3a2ec728b2