Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7cc9e1ba03af4d…

MALICIOUS

PDF

72.6 KB Created: 2020-11-18 14:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f5e88fa934fc8952834f41136e55ad24 SHA-1: 1b5dbbc692992e21030f2556c7318d43f8079287 SHA-256: 1c7cc9e1ba03af4d139a9d698afcccd8966fd9f3517acb2a64da012b9891be12
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=socratic+seminar+to+kill+a+mockingbird+answers PDF link annotation
    • https://pulibunubof.weebly.com/uploads/1/3/4/3/134378852/vexebununi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5f97dfba223fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5fb332565428c.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/pulesu-dofepaxok-nisemovez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5f9e8e01b1ff7.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/fopavobut-gabelalixipifu-bedikokasi-gigidimewosibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_5fb337e47d767.pdfIn PDF document text
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/4c008abce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f9aa15264306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vajefam/pocket_reference_by_thomas_glover.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/minecraft_mods_download_unblocked_for_schools.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 5444 bytes
SHA-256: 05c93a93fb1ffef8f0d4d54f239f64df3302dea343104989bbb67b377ae444d6
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10920 bytes
SHA-256: 8e3d3d7629ef29e007ec846820f8d2a2f3f89a52b22169388492b9b24005ce68
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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