Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d729c95ac9fb86e…

MALICIOUS

PDF

71.5 KB Created: 2021-02-27 22:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bae63855bd40c7e94eac65639d4d240d SHA-1: c243bad1217067ac6d1d767f07971afef06328af SHA-256: 9d729c95ac9fb86e5fe42ce6d0ddf07e556c0ac28bb01c9cac6b90921290db45
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a malformed exploit stream and the sheer volume of external links strongly suggest this document is designed to lead users to malicious content or exploit vulnerabilities.

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://midufefew.ru/123?utm_term=math+worksheets+4th+grade+pdf PDF link annotation
    • https://xananitape.weebly.com/uploads/1/3/4/0/134095977/5553376.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/KapkhjG/sad_video_status_download_in_tamil_share_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/NihhhQb/wizedususa.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/cFnDuZX/simawusufomameves.pdfIn PDF document text
    • https://cdn.sqhk.co/naxokujim/hIehdNF/vertical_vs_horizontal_joint_employment.pdfIn PDF document text
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/tesugigi-saloba-sagaxutimez-ralos.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/piiDQxO/que_es_un_picaporte_en_ingles.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/ihhiMjj/modern_house_map.pdfIn PDF document text
    • http://palejep.22web.org/gmail_app_jio_phone.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/dejexo_zojixuketalagan_nugixisazopatu.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/aVrgf4l/22194713592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufagarafe.epizy.com/hd_video_player_android_app.pdfIn PDF document text
    • http://fokogemuzaraw.epizy.com/mupetepe.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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 5520 bytes
SHA-256: 57e1c39df908074d71cf44b8bc648c58b10bfeb35a67b402146476d94e72afa6
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10796 bytes
SHA-256: d8a449b149c425842e631d98536ea2a250f0b8ec52c4d729032327838c0b2bd1

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