Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8766c323f8610c…

MALICIOUS

PDF

90.3 KB Created: 2021-03-17 22:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3890577bfe2004b57f1c667d75d69cbc SHA-1: 87b2ddfa45a4ee4afc262b219c9969ec096a7977 SHA-256: ca8766c323f8610c84d7a35005f14d09eb47f0f06224a7dbcd3fca5f941e7a49
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to product comparisons, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://dugedepap.ru/strik?utm_term=which+is+better+medela+or+spectra PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/hjXggjj/25757374490.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/goRVjcd/jerubapamuviwi.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/lenidajiwivefatanor.pdfIn PDF document text
    • http://narewenu.22web.org/powam.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/98052699506.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/pq6hghe/32947650072.pdfIn PDF document text
    • http://ketabizuf.22web.org/14700426023.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hdkhcja/olympic_archery_bow_regulations.pdfIn PDF document text
    • http://napojenewojiro.22web.org/malamunilagumepapoviwudep.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/ZdXJchf/free_agent_transactions_mlb.pdfIn PDF document text
    • https://cdn.sqhk.co/tatakakuwito/SheWm7F/monster_truck_coloring_pages_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/jutepoxof/cDicz1Q/23892889049.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/fluorescence_spectroscopy_instrumentation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://magapupegijovot.epizy.com/2122362727.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/interview_questions_tips.pdfIn PDF document text
    • http://gemunedipu.rf.gd/28882101733.pdfIn PDF document text
    • http://mupegutiwigo.epizy.com/rumuk.pdfIn PDF document text
    • http://vugugevijoxudi.rf.gd/bintulu_port_information.pdfIn PDF document text
    • http://punirasum.rf.gd/59318008764.pdfIn PDF document text
    • http://molutuganum.epizy.com/post_splenectomy_thrombocytosis_guidelines.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_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 5148 bytes
SHA-256: 289273a5a1ad9deecea63af1a4d902aeeab81a78f6ec2ad35466634e1d1759ac
font_01_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 10824 bytes
SHA-256: 6c6c4fb47c938dc84c3d12ac505c174bd15aa2c8909ef4e09a3788546d791b15
font_02_sfnt_off00014bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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