Malicious PDF — malware analysis report

Static analysis result for SHA-256 515b8ff958631c8e…

MALICIOUS

PDF

84.1 KB Created: 2021-04-03 13:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62fd14c12da5314b6e56a26b9b61151d SHA-1: a06d9cacb6f7d8515f90fe5944e8199860a3b547 SHA-256: 515b8ff958631c8e1d0632926b889008fa5fb84394be0f83fcc357a39f606412
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious behavior. The ML classifier and ClamAV detection further confirm its malicious nature, likely for SEO abuse or to distribute malware via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/wix?keyword=desatame+2+pdf
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/bajaxosetibusutadu.pdf
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/d21362590a1.pdf
    • http://setovewurepenu.22web.org/9962768757.pdf
    • https://bejarewir.weebly.com/uploads/1/3/5/3/135329653/37202e3e10.pdf
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/jisapujuxepobabel.pdf
    • http://fomoregekamikat.mypressonline.com/archivist_job_description.pdf
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/8688531.pdf
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/kosokuwuxisaget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_ecc9fc3ec2694ce989308e74b24023ed.pdf?index=true
    • http://beviraveda.epizy.com/dream_on_glee_full_performance.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_7975c6ee32574101a0fa2fa4aa9ede3c.pdf?index=true
    • http://wajodojizofe.epizy.com/facebook_page_analysis_report_template.pdf
    • http://tulajadulixo.myartsonline.com/vupetowus.pdf
    • http://bavatesivo.myartsonline.com/magoosh_ielts_vocabulary_flashcards.pdf
    • http://buladuwe.rf.gd/que_diferencia_hay_entre_educacion_fisica_y_deporte.pdf
    • http://wivoruremuwun.rf.gd/strangers_on_a_train_book_cast.pdf
    • http://kikisitakas.rf.gd/bteb_result_2020_5th_semester_file.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac9.bin
9aec602fdd7a1b4017d4c97cb7528f6a1149d308e393a8891ec80cc8e1cb4e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 5188 bytes
font_01_sfnt_off00011c71.bin
2eee22b37f05459df28ba4a95eb5ae2b3ca05e38c1047118ac8e9ad106786b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 11496 bytes

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