Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13e224802e7a8f9…

MALICIOUS

PDF

75.6 KB Created: 2021-04-29 10:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1c83b08eae4dcf7f3991e9786c31e194 SHA-1: 8bb92b55a18c79867821885b4573f86ca4154058 SHA-256: e13e224802e7a8f975f120212459f746c9b59ca03d109a947b6fe64fa20a59f9
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 0.9996

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://jumiwimov.ru/strik?utm_term=what+to+do+when+my+samsung+phone+won%2527t+turn+on PDF link annotation
    • http://nofovukad.iblogger.org/totuwogopuvuwot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_606568dbdd204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_6037cacf087fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_603b0d11eda86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_605b212e35083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423714/normal_6006e17ff3a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_604f069ae1545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_604eb2e11669b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_5ff0b84f2c3e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_e5064038098f4cccb3eaf17025f22dc6.pdf?index=trueIn PDF document text
    • http://nizexududitew.epizy.com/business_analyst_interview_questions_and_answers_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/dell_latitude_e6540_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/51107400786.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/17900314580.pdfIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_f59cbfde8dcb46a985f2f1ca3a7d2a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/nct_127_cherry_bomb_english_ver.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/union_pipefitter_wages_california.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/93708030662.pdfIn PDF document text
    • http://tibojerevaf.rf.gd/94824922978.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/15900200342.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_459f9454dff243f7a03112f338a34f5e.pdf?index=trueIn 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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 5580 bytes
SHA-256: 80eda4b4b2bd1e14f122cf822d006d9a2d891edd376d4e90f16ce2c5a15291f8
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 11272 bytes
SHA-256: 1ffc4e30abbeb057e745d01aeb0563c8e95687213f23b892bc3dec604af1c1fd

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