Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f787d05a1674ec4…

MALICIOUS

PDF

80.7 KB Created: 2021-02-20 13:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cf0842197035c0919558a9fb02fdf881 SHA-1: 1e7d56fbd2df918cbd751bd6411ea10c458e4c58 SHA-256: 5f787d05a1674ec40b9a6c3f34a5c567da618ce674488145cee696d78713ec28
236 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file contains numerous external links, with a significant number pointing to a link farm hosted on 'weebly.com'. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's purpose is to trick users into believing their payment instructions have changed, a hallmark of business email compromise. The presence of a 'cMD' token sequence in the document text, alongside external URLs, indicates potential command execution or redirection attempts. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://jottigo.ru/123?utm_term=modern+systems+analysis+and+design+9th+edition+solutions+pdf PDF link annotation
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/7707385.pdfIn macro / runtime command snippet
    • http://forkidsshop.online/how_to_unlock_radio_shack_scanner988aw.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/kurarofinuwa-bukiwulolo-disekifanewalub-gadidoboko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465255/normal_5fdf1dc823383.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/sudadumejiluvefer.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/rizejefebidufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5fde10b7ad4a4.pdfIn PDF document text
    • http://gujufifirisin.22web.org/lilili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/canon_in_d_violin_score.pdfIn PDF document text
    • http://depegiwisa.epizy.com/palayathu_amman_tamil_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/winrar_latest_version_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/domowesomizev.pdfIn PDF document text
    • http://volozixoxogibe.rf.gd/63920370002.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/holmesglen_nursing_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/the_bellas_final_performance_lyrics.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5720 bytes
SHA-256: 961015aad0f288b8f4b8cdba62fc97b355c8efdbc2c124d3aad17894ad8d5fd0
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16368 bytes
SHA-256: 76dbf98711f3d892ee5bf2dbd1834b30e48704e96445891e8773dc4cd8bbce0c

Open this report in the interactive analyzer, or submit your own file for analysis.