Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c2f989b7b6c142…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 05:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a6e5f68db43b28be47cf577e5e9a58 SHA-1: 76d5dec30cbead9e3d52a5793dab4a5562c42a9e SHA-256: 55c2f989b7b6c1423b5f2cf4f8d780336f46a0feb9399a2d381b0ed802c4a964
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. One prominent URL, https://xezojetit.ru/strik, is associated with a 'curious george books online' theme, likely a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=curious+george+books+online
    • http://hairsprof.ru/telinonv01f.pdf
    • https://boluzevorekov.weebly.com/uploads/1/3/1/3/131384542/6521273.pdf
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc64ae680293.pdf
    • http://stixlife.info/wenasegurogokol5w.pdf
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/7607282.pdf
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5ffe8d8d7e923.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn-cms.f-static.net/uploads/4449777/normal_606b953a6ad8c.pdf
    • http://douchehq.xyz/presonus_studiolive_32.4.2ai_manual7uefm.pdf
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5fe2f688d547e.pdf
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/bbb0e0d47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_3bf8f803cd0c482e9fba2976d059fbb6.pdf?index=true
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_979c212dac9a4eadbd6c6eeb1b4fc4af.pdf?index=true
    • https://s3.amazonaws.com/resabomibogodaw/88409875992.pdf
    • https://s3.amazonaws.com/varolexexus/ropidigasejobefonadok.pdf
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_b9143a22ddcc42d49d0360db5a162935.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc2b2bde-974d-461c-90eb-a044eb5ff5ce/premarital_counseling_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/f9f811be-b9ce-452f-a961-58fc9873a948/dell_r710_memory_slots.pdf
    • https://s3.amazonaws.com/safago/82427500113.pdf
    • https://uploads.strikinglycdn.com/files/e95d95a4-dad8-4670-aa52-72e3c1af8812/74143512394.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/31157047701.pdf
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_6aaace7593114d94a2fa4f208d71c354.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7e.bin
e6443cb96aa57d6b88e0ebeb9c50af2db864e418fea1d785dae0c7516721da51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 4752 bytes
font_01_sfnt_off0000fcbc.bin
4c83c6fa45c0392a4ebdf7a5686c4eef9ebb05cd8ae884e8e3ca65da824e5847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11640 bytes

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