Malicious PDF — malware analysis report

Static analysis result for SHA-256 256e85e96de79897…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 22:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2f2503b0d8e6df655e3d0924d527f05 SHA-1: 95a6fad7766b3bd33919d226e1a8275dce785ee2 SHA-256: 256e85e96de7989774101372fbb58353394a0144cf0b7b98891651dc06269a96
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. Although no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure strongly suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=how+to+request+a+letter+of+recommendation+from+a+teacher
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/siwigo-masilapure-wakupa.pdf
    • https://cdn.sqhk.co/kixobaza/rhgwyfM/download_hungry_shark_evolution_mod_apk_rexdl.pdf
    • https://cdn.sqhk.co/namulofilox/hhV0yjf/teppanyaki_fresno_video.pdf
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/51dacbfcb.pdf
    • https://cdn.sqhk.co/pefevepufi/chbFgcC/85773338358.pdf
    • https://pajatekudox.weebly.com/uploads/1/3/1/0/131069898/wubafafototepan.pdf
    • https://cdn.sqhk.co/libuzewis/ijQjchh/free_wallpapers_for_desktop_computers_backgrounds.pdf
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/72108e155a.pdf
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/zuninapuwoni.pdf
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/tijeguwopugavo_lijezada_badaru_kojoji.pdf
    • https://vagaletufuwowi.weebly.com/uploads/1/3/2/6/132681464/pinidad-wolepow-vufukojano-sakafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e4c0c44c-e216-401d-9570-8186dbdba4e5/rofis.pdf
    • https://uploads.strikinglycdn.com/files/fc61096a-8f86-47ac-b457-7bd6412938da/wesawetewosoji.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_aedda5836d8144d382ac4606456ebe6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7e0716a-0c79-49c6-9bf5-dee578076150/gizat.pdf
    • https://uploads.strikinglycdn.com/files/f068499e-a9f6-4d98-b7e7-b1f69ac32b3f/48999280950.pdf
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_0b509fa3b75a44648ed155c779f2674f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb79e22c-a42e-4ed9-a329-bd61afdf3bb5/73251615612.pdf
    • https://uploads.strikinglycdn.com/files/b1f15eec-5f0f-452d-9c9e-dddf44a7f331/polarazurusebuvada.pdf
    • https://uploads.strikinglycdn.com/files/7a0d7922-d1f8-4e06-b02c-f87932b8c31c/what_is_computer_file_in_ict.pdf
    • https://uploads.strikinglycdn.com/files/0060759a-3d0f-4b6c-8d4a-7a9548873d64/elements_of_music_quiz.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f7.bin
fcbf997ef4c35ab567bc27791cb41dec10af2eb92b2ba42009253e02a3723961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 5324 bytes
font_01_sfnt_off0000f6e9.bin
424135c03774e7c5294fbd37959ec2b41b074d94212c93428072dc0b767cd6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 10716 bytes
font_02_sfnt_off00011b5f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 4324 bytes

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