Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e9bfa591251ae9…

MALICIOUS

PDF

90.6 KB Created: 2021-05-03 12:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0126bb263f20fe71a834a6cefce8232b SHA-1: 21a3af68ec376b6d9e43020a9b0f88bb1e294817 SHA-256: 40e9bfa591251ae9d6af915358a6b59b66e3d97d8779e89fc3c4726f6b7da4c8
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 hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+replace+ipod+nano+5th+gen+battery PDF link annotation
    • https://cdn.sqhk.co/xuxinugad/RghBjcJ/the_girl_in_the_window_movie_trailer.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/76282687826.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/6pbCgd5/93140794080.pdfIn PDF document text
    • http://tolisona.iblogger.org/coronary_heart_disease_guideline.pdfIn PDF document text
    • http://nizozipup.22web.org/26860707376.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/ehjRif6/71596127238.pdfIn PDF document text
    • http://zujugowez.iblogger.org/amore_liquido_bauman_download.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/what_are_the_physical_and_chemical_properties_of_sodium_hydroxide.pdfIn PDF document text
    • http://bitukab.iblogger.org/loxev.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/gegaki.pdfIn PDF document text
    • http://wadipogi.medianewsonline.com/wapidixukikazumojovelena.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/woxojurululujij.pdfIn PDF document text
    • http://tojukuw.iblogger.org/78301476280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xunepaja.rf.gd/icao_airport_code_list.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/introducing_new_employee_email_template.pdfIn PDF document text
    • http://gagonunanu.epizy.com/brave_new_world_book_free.pdfIn PDF document text
    • http://guxasimedoki.epizy.com/63158488691.pdfIn PDF document text
    • http://wetizizokixo.epizy.com/tojewogukudawi.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/89129072389.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_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 5576 bytes
SHA-256: 74ca071bf534966473bad7d82e585b4b8bc83e4e1af6346db05bb70ce08ae7f0
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 11200 bytes
SHA-256: e5c0a2a3a940b4f9de39f5d3b504a57023620e9bf49e93abe1b19955a00ee54d

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