Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2981a59f2b1ad15…

MALICIOUS

PDF

81.6 KB Created: 2021-02-28 18:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c873168e76677915f20a4cff5ee1bb7e SHA-1: 5b10bebf46a9baf52de70f0eaa9449b38eedb21e SHA-256: e2981a59f2b1ad15cf5ca63ed15722abc1afed73045e50f8ebc2874d0c6d0857
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=is+the+fe+exam+necessary PDF link annotation
    • https://cdn.sqhk.co/norifasil/amQ9gfX/zemukukete.pdfIn PDF document text
    • https://jigukijovumide.weebly.com/uploads/1/3/0/7/130740363/memebakeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5ffc8dba297dc.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/Fb2gj4p/54096029337.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/wQLziiC/xabajovosiruwovuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/Qih7his/8711084307.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/gcoLEih/pepuxemazevoxotakozulenez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5ffd630862b45.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/hek7yje/jaxatezimemekojunobap.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/KgeihvC/ben_10_mod_for_minecraft_pe_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_602f8072504af.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/7379381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fd27eb8d7980.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/jifRLxa/98874778781.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/mixanaz/gelonijuvalobige.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/natalogotaxev.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/fawatavuzedemotafo.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/forklift_driver_license_template.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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 4824 bytes
SHA-256: 7cd2f8b38dda4394fdd91e5a0ff35e1b3c437a93f5184c45219edee148f95bdd
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10856 bytes
SHA-256: e645b944d2d164bc8860541c5996c90eda64b9d89b8dd5590a94d40f37726a79
font_02_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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