Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b63554398ca12b…

MALICIOUS

PDF

79.2 KB Created: 2021-05-20 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2af641486bf7739e485a6dc19d5a989 SHA-1: b0993103115e87a5429f8bbcced3dc9cf17e0c59 SHA-256: e6b63554398ca12b55780bd2f5c8933a486264df74c34d9ab25d7a453c03310a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The primary URL, https://zajinet.ru/strik?utm_term=how+to+say+something+in+an+irish+accent, is presented as a document title, likely to deceive users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://zajinet.ru/strik?utm_term=how+to+say+something+in+an+irish+accent
    • https://dijatetobof.weebly.com/uploads/1/3/4/3/134322453/6537115.pdf
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/eba9b644d71c6.pdf
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/9208495.pdf
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/bc2a9d5.pdf
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/879519.pdf
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/pegazufux-bugafer-bajatapitibi-newexud.pdf
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/1628325.pdf
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/2445496.pdf
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/286258.pdf
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/6725039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zabejuvijolu/32328888283.pdf
    • https://uploads.strikinglycdn.com/files/a715b79b-d5bd-46fc-b075-554cbbb2c9c8/reinforced_concrete_shear_wall_design_example_bs_8110.pdf
    • https://uploads.strikinglycdn.com/files/0026f272-9f98-4dac-9b23-70965ed2b34e/the_laramie_project_book_sparknotes.pdf
    • https://s3.amazonaws.com/gixawetopoli/24370719626.pdf
    • https://uploads.strikinglycdn.com/files/16dd3932-0c27-4bb6-ab5e-41af460002ce/sopenajofufamilebanub.pdf
    • https://uploads.strikinglycdn.com/files/54ccecc9-5218-411e-ad1e-a8fb6f4e9fd7/philips_norelco_5000_blades.pdf
    • https://s3.amazonaws.com/fejatepudopito/arafat_ki_dua.pdf
    • https://s3.amazonaws.com/vonusirukete/5093950237.pdf
    • https://s3.amazonaws.com/wofaxil/71563805011.pdf
    • https://uploads.strikinglycdn.com/files/6039b728-951f-4f4a-97b6-65ad51414cc4/zuwajulugugabukuk.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_off0000f755.bin
44c02892b478eebd2803d801a746cb4207149b99f83dd97f00cd94a39e49b738		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 5336 bytes
font_01_sfnt_off0001096b.bin
b94a2ce1ab2de3e0a58c90dadb67a69785a3eae61789c531e37e5231dc581f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 11000 bytes

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