Malicious PDF — malware analysis report

Static analysis result for SHA-256 4575a35d447aa72d…

MALICIOUS

PDF

81.7 KB Created: 2021-03-14 00:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c0e7ce59a0f3bc70ccce6a9ef3c5440 SHA-1: a9b74b47b784a9773434221fea8325968112c1b3 SHA-256: 4575a35d447aa72ddc4f9600593e3cc97ec3db575e48583e1636094900f4b97f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF phishing or SEO link farm. It contains numerous external links, with a primary suspicious URL pointing to 'maypoin.ru'. The PDF structure and heuristic firings suggest an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://maypoin.ru/123?utm_term=r+a+c+police+full+form
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/9991570.pdf
    • http://jikusofare.mywebcommunity.org/99272851927.pdf
    • http://konalofasu.mywebcommunity.org/blister_packing_machine_working_principle.pdf
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/2037684.pdf
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/1168654.pdf
    • https://zilibadokaji.weebly.com/uploads/1/3/2/6/132680781/tomunavugelefumes.pdf
    • http://zomesotemaxage.66ghz.com/zedonilepoto.pdf
    • http://lofoporubatul.mygamesonline.org/xekuw.pdf
    • http://damomemisogadex.iblogger.org/fojupujowolexe.pdf
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/8833481.pdf
    • http://latozon.iblogger.org/cefalexina_bula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4603ce2-621c-411e-a68b-c6bf1c56e79b/47012751926.pdf
    • https://uploads.strikinglycdn.com/files/a5d001f0-c4b3-40be-937f-1b0c0fbfe3e1/see_me_nicholas_sparks_movie_online.pdf
    • https://uploads.strikinglycdn.com/files/9f4a24a0-0a5f-4076-a553-0a928d2a5391/sutuzosok.pdf
    • https://uploads.strikinglycdn.com/files/6d4ca7b9-221b-4de8-81aa-0c84517ef961/zabobe.pdf
    • https://s3.amazonaws.com/galinikagopit/momolimeb.pdf
    • https://uploads.strikinglycdn.com/files/14981056-6bcb-4142-886f-6dbbdd4208f3/19129880226.pdf
    • https://s3.amazonaws.com/juliziwojatige/didukisopu.pdf
    • https://uploads.strikinglycdn.com/files/dc5534fa-6768-443f-b44c-3b5b9838c43d/13746133857.pdf
    • http://bufijonewufo.onlinewebshop.net/cradle_to_gate_vs_cradle_to_grave.pdf
    • https://s3.amazonaws.com/gezetega/53930816338.pdf
    • http://tudozujuxijoz.rf.gd/break_dance_video_song.pdf
    • https://uploads.strikinglycdn.com/files/32c06213-6d48-4815-8266-6affb3412ef1/how_to_calculate_mode_median_mean_and_range.pdf
    • http://gebaruzowulidus.epizy.com/88264156411.pdf
    • https://uploads.strikinglycdn.com/files/0e0239dd-ef4b-4df0-8a9e-98055c82606e/citizen_eco-drive_mens_at4010-50e_titanium_perpetual_chrono.pdf
    • https://uploads.strikinglycdn.com/files/641d7ab2-bb40-4ee6-b0d6-c4854f125f2d/dowibosi.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_off0001023f.bin
8bd3199bd55ffc29369861c77973e5d98eed707580d370302e9cae8abb0716bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 4988 bytes
font_01_sfnt_off0001132d.bin
b0098052d71172486babc24862060d8ec0f0fa79cdaa6499520300a5c3142863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 11168 bytes

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