Malicious PDF — malware analysis report

Static analysis result for SHA-256 22433ec5d9afa30d…

MALICIOUS

PDF

79.2 KB Created: 2021-03-27 14:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bc52bb01f06fb0d6bf81ee2461a4bdd8 SHA-1: df7ab403e877738424f3fa3b38dc60a53c22a33d SHA-256: 22433ec5d9afa30ded9a67a3f4c6f04898bad9e56ae8ac888f3c471f2d06d5b0
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=wen+6510t+oscillating+spindle+sander In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fe786d81c828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fccac92480bb.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/kibazojumisaxokuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fd1e6e6e2f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_5fe999a7e82ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_60103c9c58517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5fee7ae8c43f3.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/rikimogelemunat.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/zopavow.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/1454297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_6011176b9f546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_152cca7d87c24ac685487c053542c5ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/pagexed.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/baron_de_montesquieu_separation_of_powers.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_d92067444c464c07901f89aa049d96fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/heat_exchanger_crack_repair.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_1f75dfaef3b347e5a76f4e06a8e37822.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_ba234f81466e4bbaa9b413a72bbe5fb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xulikamul/kumeviriko.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_2af75b70352947d8879c6903ecb6d30e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/havana_sheet_music_on_clarinet.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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 5728 bytes
SHA-256: 2e29b57d0e5b595c2160317c46ca20c033e9764fb545b96ca05db6ed9ca200be
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 11920 bytes
SHA-256: 39641b685c46d8f1dfc308eb0893ca814d20d0bb3b1bebcadd1a765b0d875b80

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