Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dd7c48985b47f2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 23:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b73b40506e59b8162a4e8a7574252a1 SHA-1: 1945a49d298fc98da9778e9c4389a1ac036a9831 SHA-256: 67dd7c48985b47f253c8b983b35721ddae80d2023cafb28f2e144f1285937bd3
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs indicate an attempt to distribute or link to other malicious or spam content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8778

Heuristics 4

  • 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
  • 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://seumenha.ru/award?keyword=development+economics+theory+and+practice+free+pdf
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5fcc7765a2f7a.pdf
    • https://cdn-cms.f-static.net/uploads/4470985/normal_6015bc1b12208.pdf
    • https://cdn-cms.f-static.net/uploads/4467593/normal_605f4f7fd47b9.pdf
    • http://mezogevap.mypressonline.com/tofabakimumoliludo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2f2e7386-ae2f-46d2-939e-2241c866f757/90526402952.pdf
    • https://s3.amazonaws.com/rutufokedizon/ashwamedha_audio_song.pdf
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_ba7b2d417f374cbf99f543a48c1d415a.pdf?index=true
    • https://s3.amazonaws.com/numegubowalonan/descargar_bejeweled_3_full_android.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_a63045f4de354908a02e9f9a0c577c1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8271cab-af57-4f5b-934b-71e2ffbe4a7a/how_to_change_the_4_digit_code_on_a_schlage_keypad_lock.pdf
    • https://uploads.strikinglycdn.com/files/5fb4df27-e0e5-4b72-bf4b-53db2ca3b4f3/8259772898.pdf
    • http://wukevivetarapu.myartsonline.com/what_is_a_case_summary_in_social_work.pdf
    • https://s3.amazonaws.com/sorogamat/windows_10_missing_calculator.pdf
    • https://s3.amazonaws.com/wukevirenesu/sarawulesixixefed.pdf
    • https://uploads.strikinglycdn.com/files/1e9916d9-4975-4383-9a33-8d9ff985cc5e/11925890996.pdf
    • https://s3.amazonaws.com/davolazupivowi/bawixinuloxira.pdf
    • https://s3.amazonaws.com/xokebore/51363816832.pdf
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_1d1cff0853b04064b0c6922315c8b47a.pdf?index=true
    • https://b36ad067-21ef-4b17-9055-1dfcbb3fb98c.filesusr.com/ugd/8673ad_7e9a6317cec64e378949ad9b1b116966.pdf?index=true
    • https://uploads.strikinglycdn.com/files/959077e0-5eb9-45f3-a29e-ceddbb91621b/how_to_do_an_if_then_statement_in_excel_with_colors.pdf
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_edacc4ff85344b33a7007ada0877ca4e.pdf?index=true
    • https://s3.amazonaws.com/gonima/2nd_grade_math_word_problem_worksheets.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f6.bin
781cc203d76e831539f89595da3a2a4c39bfa2c4846884fcc2b3fb7be5e0f34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 5344 bytes
font_01_sfnt_off000102fe.bin
eca9a8e623594a27b13f8c69840b723fb5982aff373b7a6bad4e0d18cb0458e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 10592 bytes
font_02_sfnt_off00012703.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 4324 bytes

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