Malicious PDF — malware analysis report

Static analysis result for SHA-256 9804d25b5f4cf0be…

MALICIOUS

PDF

84.9 KB Created: 2021-03-28 05:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89eaebdfe3f0a92eaf0d77e70bfc82a7 SHA-1: 7e12bcb704c0e6f714816cc1e8bf251e02d30c96 SHA-256: 9804d25b5f4cf0becf9ebb6a311affd2f0b2d74aab836948ebe1b5054d7315f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a link farm, suggesting a phishing or SEO manipulation attempt. ClamAV and ML classifiers also identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs indicates a likely attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=parts+of+vermiform+appendix
    • http://tawabuzawi.iblogger.org/binary_system.pdf
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/feeebed72858.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_604db72a55304.pdf
    • https://napuguvu.weebly.com/uploads/1/3/0/9/130969658/5012360.pdf
    • https://static.s123-cdn-static.com/uploads/4409610/normal_60049ae8c13c3.pdf
    • https://bagesasadav.weebly.com/uploads/1/3/4/3/134383367/rezumeluzatuva.pdf
    • https://cdn-cms.f-static.net/uploads/4386848/normal_604674bfc5231.pdf
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5fe84b2d2779a.pdf
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/xugobemeti_posakila_mizeke_milad.pdf
    • https://cdn-cms.f-static.net/uploads/4405208/normal_603a57ce61288.pdf
    • https://cdn-cms.f-static.net/uploads/4494149/normal_5fdc3de58e4e3.pdf
    • http://bojikewexojok.iblogger.org/2008_honda_crv_service_schedule.pdf
    • https://cdn-cms.f-static.net/uploads/4402481/normal_6020b31e0c079.pdf
    • http://pidawiwosoda.iblogger.org/hadestown_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_616604a29d964fe88fa08a2287aee67c.pdf?index=true
    • http://pujusojup.epizy.com/manet_mobile_ad_hoc_network.pdf
    • https://uploads.strikinglycdn.com/files/9a1b1c7c-a345-422b-92ee-eabb4b425351/how_to_fix_cracked_lg_tv_screen.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_38f6d855683c4be5bf10009b7f05923a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69167262-9d0f-4746-881a-9307ac357d8d/video_games_lana_del_rey_lyrics_greek.pdf
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_aec64edeef3f438cbf502a6bdba0d71d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/317af05e-dac7-4112-bd1d-701f0504d044/pax_romana_definition_deutsch.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_off00010dd2.bin
c50bd46db3dae43acb29b4ccc8dc868f979088419c3d4c9ec3d99bd47b623a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 5284 bytes
font_01_sfnt_off00011fc1.bin
e97d31ea1615ce9aeb8c3d58bd90709da7f14d19e3db0e4cce40c803725690d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 11516 bytes

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