Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9658d0d18369c2b…

MALICIOUS

PDF

83.0 KB Created: 2021-04-15 09:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c63a529200bdbda5f0a13682d20e593e SHA-1: 4b981c48bb7f045e64983bb1b9cafec7d3ca22e5 SHA-256: e9658d0d18369c2b2d74e6bf2a073a3de81b685176556a6e955cff8357e3759c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially corrupted, contains text suggesting a review and includes references to 'wkhtmltopdf', a tool often used to generate PDFs from web content. The presence of external URIs, particularly 'https://maypoin.ru/strik?utm_term=it%2527s+kind+of+a+funny+story+review', strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=it%2527s+kind+of+a+funny+story+review PDF link annotation
    • https://cdn.sqhk.co/suwefememe/cjgmhcZ/spotify_maximum_limit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6033a6147972e.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/94584255453.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/Wja3uid/26531230797.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/jurnal_budaya_organisasi_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_606e2a6a85b29.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/predator_generator_9000_vs_8750.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/carcinoma_infiltrante_de_mama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_603eb451b52f0.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/UNhejfc/gezedisafadoweveve.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/dghkILT/answer_to_thank_you_in_japanese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_60591bcf0b0fb.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/7lYughd/bge_pszk_szakdolgozat_formai_kvetelmnyek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_6052465c5ad22.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
    • https://uploads.strikinglycdn.com/files/a0e8629d-2e6d-414b-80f9-0b2adde2f58f/evh_5150_iii_50w_combo_review.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_04a2bde90f994cef88ffd2d719869a5c.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/cherub_brigands_mc_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da0879f-f2e4-4157-9af6-c600a1e2e5f3/nuripekefavaxen.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/ru_admission_circular_2020_20.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_97b6b8afc4ff4ae0b2f9b2d712105a81.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_a2af774b1b134a8a9f0113c853fd4621.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_0a3c479fc35b46fdb9e6f8b1c45b6167.pdf?index=trueIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_7243cf21935e48549829d2f54ade0fd4.pdf?index=trueIn 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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 5040 bytes
SHA-256: a7a1980d80f8d1ce0569f4e1792cb5338e932676011f225e7098a82fc4e6bd73
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 10884 bytes
SHA-256: 02f658f99214835aca06749869f6e078be09ab9cbc2e11e78e3c27351ca70317
font_02_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176