Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe29012ccea7722…

MALICIOUS

PDF

78.1 KB Created: 2021-04-30 03:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cfea6bb3c6068dc050dc26359fcaf2 SHA-1: 2a3195223733692f107bf450959edec8b1a86547 SHA-256: afe29012ccea772265284b4b52ced1e11660dd115af43f557f7b00e47be41744
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous URLs point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://botokaw.ru/strik?utm_term=niv+large+print+reference+bible+personal+size+thumb+indexed
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/fipopam-fijaguzikozez-gewoxe-laxofope.pdf
    • https://cdn-cms.f-static.net/uploads/4476930/normal_6009f024871f3.pdf
    • https://nusuvonofa.weebly.com/uploads/1/3/1/8/131872273/c363fe602efa.pdf
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/0017c6863f81f6.pdf
    • https://cdn-cms.f-static.net/uploads/4426277/normal_606ddad0c5518.pdf
    • https://static.s123-cdn-static.com/uploads/4416938/normal_5ffeb7faa11c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_1e25dd5ced7a424b8987ae00c7bb90ea.pdf?index=true
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_8a9e4e1dea8547afad24e13a95bd4408.pdf?index=true
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_53aaeb3db6d24c6f8a3e3594662f0fba.pdf?index=true
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_8cd0b7f3b99a42d796e7f7ed4fc7b664.pdf?index=true
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_453141ef1c764417a9a07ff344b40b98.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_04d7848419c74cd2a292a20dcbae391e.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/rick_steves_florence_guide.pdf
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_07ee9bde2b954ad1a73b133a5ec522d7.pdf?index=true
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_954f658901ba45b6aceb27e7fbc07c4b.pdf?index=true
    • https://s3.amazonaws.com/gazijewevan/pamasefeguvakelemosakari.pdf
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_53a9aba5ccf44623ab6274aa9a037f5b.pdf?index=true
    • https://s3.amazonaws.com/mokamoba/20805542580.pdf
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_9ae110ad21ca455ca3b635138ee22bd2.pdf?index=true
    • https://s3.amazonaws.com/dubiditiginowo/4_pics_1_word_level_2371.pdf
    • 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_off0000f068.bin
879b29b89c125c81262ceb2bab7e3e57704b4059b338b736e406530ae60fc573		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 5856 bytes
font_01_sfnt_off00010443.bin
f1411d5046648b77ee917a34b59200152fa05866a819d866066db71cdf1784df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11584 bytes

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