Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2011ca571582c51…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 22:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c31e4d9e68ffc0b1040c8c114e690515 SHA-1: de1c3bb52807c9ba9647704414c1a6b155517637 SHA-256: c2011ca571582c51ace646ea98d1f74fee7194c7b0234b97c7e8e8822849679f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to malicious websites. ClamAV detection and ML classification further support its malicious nature. The embedded URLs are likely used to host phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=sony+dvp-sr510h+region+free
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/1677544.pdf
    • http://5coupon.info/fusiwumodosigabopilubial2u4.pdf
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/9094193.pdf
    • https://cdn-cms.f-static.net/uploads/4458840/normal_605a8f2136ba2.pdf
    • http://tabikola.online/orbit_water_timer_model_27729av3wl.pdf
    • http://profer-opt.ru/sibarabafukufexolebasasic6btj.pdf
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/rexakage.pdf
    • http://regvoolkim.website/end_credits_meme_song_downloadfw7lv.pdf
    • https://static.s123-cdn-static.com/uploads/4466408/normal_60038e50aea72.pdf
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/jamitinewamavewa.pdf
    • http://creditpm.com/online_quran_teaching_jobs_from_homecd7yz.pdf
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/xokewuvijozev_sidarasezal_goxud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_0eb4c5bd28304802bdf9821402a494c9.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_c55862edf2e94c11afceada49dc81854.pdf?index=true
    • https://a943cdc4-551e-4fd6-8842-bb1c82e441e2.filesusr.com/ugd/a0303e_e31a1b965da049cea09d2e750acf3afa.pdf?index=true
    • https://s3.amazonaws.com/pojikovewijeja/84235059827.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_539bdc581f7f47cb94c3ac8e9009dbc1.pdf?index=true
    • https://s3.amazonaws.com/polojuliragam/78602910243.pdf
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_7cb9bbc085064ddbb8e79af72af98c6c.pdf?index=true
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_3d01e2f5c66d407089b25f07be2a0a8c.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/gimifagov.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_51d57f80bd7146439832bf23961deb97.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_off0000ead6.bin
218d75ba0e40b89f5376cc4ffb6149fc9b2cb7c9bb7eb76e8cef189f5d3134f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 5676 bytes
font_01_sfnt_off0000fe51.bin
0008a59c2869f6a4a591366975e2461a3926077b3b01500fa53fa34f64557c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 11036 bytes

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