Malicious PDF — malware analysis report

Static analysis result for SHA-256 8544ba44744d890b…

MALICIOUS

PDF

74.9 KB Created: 2021-05-19 19:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4c048df8e1631589dc3d213a2e61eeaa SHA-1: aeb76969c37e16c53fe82934c35234d45a607ca1 SHA-256: 8544ba44744d890b3fd335f32933ca2d62f8b502e8e02e86bd65499dad89a931
186 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 0.9997

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://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/f8c9e.pdf In PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/6759610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_6032708561ae7.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/nujoniferega.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/db2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5fd7cda396a35.pdfIn PDF document text
    • https://kotogafisix.weebly.com/uploads/1/3/0/7/130740127/0282a1757.pdfIn PDF document text
    • https://gipudakewisuvu.weebly.com/uploads/1/3/4/6/134665668/1088818.pdfIn PDF document text
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/e24c987c8a5acc.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/5924156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_601388c6edb5f.pdfIn PDF document text
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/fogolatumasusixitud.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/banosanolimude_sisag_wemidiwukov_miraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_602896d41eede.pdfIn PDF document text
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/fupedakon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=characteristics%20of%20impressionism%20and%20expressionism%20musicPDF link annotation
    • https://uploads.strikinglycdn.com/files/1cb3eaca-6c7f-4ea3-bd3c-aec7c087cdda/fitonadobajeburibanerefo.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/gsheet_file_to_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f474c8bf-6c96-48d7-abd6-a17a15230b9e/star_wars_rebels_jedi_knight_review_ign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7534a9-b509-494b-b171-c1a22cf91c6f/white_chicks_monologue.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/83851082247.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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 5336 bytes
SHA-256: fb4a89e5ef39933cbc9579ebc26089d17713c67ed8a60b779aa04514195f9919
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 10548 bytes
SHA-256: 45c49d908ece7ac003862e9d19fbad8499a01ce32dcce215d12cafde5910a663

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