Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae4d53c3ea990ec…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 11:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 181f7787dca4123bbe24a57ba35bbaa1 SHA-1: aa4fbd823920f22f59ce759bd4300ff9862df864 SHA-256: cae4d53c3ea990ecb54fc7b015fc66c07319b15a372498772351c5c6158fbf11
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and link farm behavior suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=can+i+charge+nimh+with+lipo+charger In PDF document text
    • http://instasavephoto.com/m-audio_keystation_88_mkii_midi_keyboardn3504.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/vQusiaT/39298442545.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/zieJ9rK/facts_about_kobe_bryant_and_his_daughter.pdfIn PDF document text
    • http://dimax.website/xuxulekikesemofovakowif78kk6.pdfIn PDF document text
    • http://specrazreshenie.com/142439586486o0qt.pdfIn PDF document text
    • http://remontlegko.info/nbxsg.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jdURPge/wulenuxa.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/wesijepasoxajonadigusxd9w.pdfIn PDF document text
    • http://salestore.pro/how_to_install_a_pellet_stove_through_the_roof97qht.pdfIn PDF document text
    • http://salonly.xyz/suzuki_piano_school_volume_1_free_downloadfnefj.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/zhabREn/33627950177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_11ae615384304b619592481bc0095242.pdf?index=trueIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_03ecce2293ad4b4fa91ec40295339746.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_6c9fe7a917be4b2fa3aad6372a9b0e1a.pdf?index=trueIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_942ccaf208b94fd9a7274c58269b0201.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_9f59651acd2546748c834d65b8b62c8b.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_baf7dfad6b6c4917a715b1a1be310f1d.pdf?index=trueIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_e034d2771bd841d38c97bef351c9e972.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_9fb23094a6e0496a94bebbea50bd5d75.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_edaf3cd74c874ab08132a21d2991fdab.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_a5298c78f3c44ff89ec39f07014abeab.pdf?index=trueIn 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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 5168 bytes
SHA-256: 807ca144af37c8c7677eb8587ced42624325d3e67026624c4f184972f384ecc5
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 13184 bytes
SHA-256: 802882df193dbb64ffdf40d79f69b910574c9e1cf832138adb8a4eee515eadd1

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