Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f0f586fb218041…

MALICIOUS

PDF

80.5 KB Created: 2021-03-15 14:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b61c84edaa1fae9debaa6a0a52d9822 SHA-1: 29e982666f0d0f5e855afdad21c9ec99ce57b6f3 SHA-256: f1f0f586fb218041f11471f68b34bfab07bba8afe452ac27ddcea104744aed8f
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to SEO-optimized PDF hosting sites. One prominent URL, 'https://zajinet.ru/strik?utm_term=kirby+vacuum+doesn%2527t+turn+on', suggests a phishing or scam attempt disguised with a common search query. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=kirby+vacuum+doesn%2527t+turn+on
    • http://thedefenseforge.com/ducktales_theme_song_piano_sheet_musicajtpt.pdf
    • http://instahelpforbusiness.com/hi_bird_250cc_chopper6xdc1.pdf
    • http://theplafond.xyz/dell_latitude_e6410_usb_portskwtfy.pdf
    • http://classicalnaturally.com/dedonesawozom5p0.pdf
    • http://intekzafast.online/amana_microwave_error_codesenhdb.pdf
    • https://witetalujoloxof.weebly.com/uploads/1/3/0/7/130740434/1239900.pdf
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/3849f7f1c6bb8e8.pdf
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/sepito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sesilav.rf.gd/88993316395.pdf
    • https://s3.amazonaws.com/minabiwa/judadokikalopumeduzovovo.pdf
    • https://s3.amazonaws.com/leributafa/vikufir.pdf
    • https://s3.amazonaws.com/natewared/7383743131.pdf
    • https://s3.amazonaws.com/nimuwet/21701241228.pdf
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_20a21bcaacde408683c058fedda513b0.pdf?index=true
    • http://pexedidal.rf.gd/24173230193.pdf
    • http://kexasejuwodeji.epizy.com/jekixavabudatezikor.pdf
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_00f11c67f68d4adf8e77a7ee2351f803.pdf?index=true
    • https://s3.amazonaws.com/mudurixo/ropasiroxawawunasedesa.pdf
    • https://s3.amazonaws.com/numegubowalonan/concise_idiosyncratic_gapped_alignment_report.pdf
    • https://s3.amazonaws.com/metakibeme/how_often_to_clean_ruger_lc9s.pdf
    • http://kovemipenege.rf.gd/voice_synthesizer_free_android.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_e064c6dd8bd640d19ff2ccaf6a58ebb4.pdf?index=true
    • https://s3.amazonaws.com/wexoteluwag/example_article_format_spm.pdf
    • https://s3.amazonaws.com/kesumasaka/how_to_read_lochinvar_serial_numbers.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_off0000fbaf.bin
a20486c01a181d42f786befc67b58592a6938862221ca92a831f39c2d529bd27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 5360 bytes
font_01_sfnt_off00010de3.bin
ba6810c55ab17d94922a4d60658e539ef04f01ca99417de1254913968bdebd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 10764 bytes

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