Malicious PDF — malware analysis report

Static analysis result for SHA-256 392dd5e97e81adba…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 23:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 653b52ab6cbc912a2919e275165ecc70 SHA-1: df6337634f79c42584a603a2c2cfee009a14adab SHA-256: 392dd5e97e81adba38bc10610bec359f3ebe10d9508c88717ab39c797447f354
156 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 PDF files, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://seumenha.ru/strik?utm_term=software+architecture+diagram+explained
    • https://cdn.sqhk.co/ropobemuma/fRgemhb/36878015332.pdf
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/rifowabepabise-lamebape-zejipuk-kejeve.pdf
    • https://jowozulabu.weebly.com/uploads/1/3/4/0/134013075/1067368.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdf
    • https://cdn.sqhk.co/jobiwokojo/yhggjf5/89819960885.pdf
    • http://rijoginijamibeg.mypressonline.com/acog_2020.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/2cc2ada649.pdf
    • https://cdn.sqhk.co/vatuliwa/hfujdii/linkedin_login_button.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xoruxagejot.rf.gd/giwupikebevomofiru.pdf
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d1f7996eee9042708ff374b5df812182.pdf?index=true
    • http://nivujipa.epizy.com/70059320981.pdf
    • http://lugenizuridaj.atwebpages.com/14011579019.pdf
    • https://s3.amazonaws.com/widiku/guided_reading_activity_6-_3_world_history.pdf
    • http://merigodivibamot.rf.gd/posijopoloril.pdf
    • http://rekewam.rf.gd/schwinn_airdyne_ad4_repair.pdf
    • https://s3.amazonaws.com/lanorolowu/fire_emblem_gba_sprite_sheet.pdf
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_90b300caa08b49839db749451eae47ee.pdf?index=true
    • 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_off0000ec70.bin
35991606016418d2460a5bb9403eaee497c08770a95ee933e13f958193876488
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 5656 bytes
font_01_sfnt_off0000ff9e.bin
378acbab9866365140d0c46ac10aacfb681c40fc34517230ac393ea1818827b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 10624 bytes