Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b8d6306b99321f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-16 07:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088c96021296da369965d681fc8e076e SHA-1: 9e5f64798201c4f39a73919a441895cd34433883 SHA-256: 61b8d6306b99321f6295aa1cc951e0037af612e72e6e33d712f931f371e324df
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, embedding numerous external URLs that redirect to other PDF files, likely serving as a distribution mechanism for phishing or malware. The document body, though heavily obfuscated, suggests a lure related to 'electrical symbols' to entice users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://druttle.ru/award?keyword=basic+electrical+electronics+symbols+pdf
    • http://suziterunedoloj.sportsontheweb.net/banukezigowar.pdf
    • http://fruitslope.online/allotment_letter_format_under_maharerag6kd6.pdf
    • http://sweetygirl.club/problemas_optimizacion_selectividad_ccss6rn4z.pdf
    • http://bitiwiz.medianewsonline.com/cantonment_act_1924_pakistan.pdf
    • http://vannabanyavsedela.xyz/alan_watts_meditation_musicqp4u9.pdf
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/2847343.pdf
    • http://baugroup.info/1295985181pa85l.pdf
    • http://samyog.ru/raburapojemimhxyx6.pdf
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/c630ae4ff773a7b.pdf
    • http://wusokamojifel.scienceontheweb.net/qualities_of_a_good_ecd_teacher.pdf
    • https://finugerijit.weebly.com/uploads/1/3/4/7/134702994/964445.pdf
    • http://buwovavozu.getenjoyment.net/amtrak_capitol_corridor_schedule.pdf
    • http://misujupino.getenjoyment.net/ajaran_sesat_di_malaysia.pdf
    • http://rawitotizoxuk.scienceontheweb.net/pumoperojozamesolelinonu.pdf
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/9495827.pdf
    • https://xunusavijogomos.weebly.com/uploads/1/3/4/7/134702941/tejoperax.pdf
    • http://setopin.mypressonline.com/accounting_techniques.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_7056071ce693429ca1ed0fa020dfd46f.pdf?index=true
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_67500cd14d7c4601b565fcda19bfc05f.pdf?index=true
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_24288f6841484dcaac1b2c2a8a658c08.pdf?index=true
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_9bd87e4738464ec2adaa19a59537d463.pdf?index=true
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_ab9c1fcbaea745d182a264d3c65f7324.pdf?index=true
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_5fcf4f23e34d47c4b12e359aa0ca3c9a.pdf?index=true
    • 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_off0000e530.bin
f724faafab7f0ce5f134f7945afb61256b9dfe50109feec9402d6fd82ba721c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 5592 bytes
font_01_sfnt_off0000f821.bin
b819b84f93cf7f5535e5d824406c9c120877ce5ff0d22ab1120971820c8a3c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 10376 bytes

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