Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dca5b9ebc09380…

MALICIOUS

PDF

81.4 KB Created: 2021-03-14 10:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd9daa6e9eac78c73b150ad8ba64f2f SHA-1: 45f79f8acf1cd72f656e82ceb08122252542dd88 SHA-256: 98dca5b9ebc0938027ab4a29054dc8078ca5de60ff7b05bbcc4979d83e0bee7f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains a large number of external links, many of which point to PDF files, suggesting a link farm designed to distribute malicious content or phish users. The primary URL identified is https://jumiwimov.ru/strik, which is likely part of the distribution or redirection mechanism for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jumiwimov.ru/strik?utm_term=frindle+book+plot
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/240e9f72c9.pdf
    • https://cdn-cms.f-static.net/uploads/4465388/normal_600d9715aa6ad.pdf
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/gikujunanivibib.pdf
    • https://ruzowevo.weebly.com/uploads/1/3/1/4/131453610/1556a.pdf
    • http://jopimutedu.iblogger.org/best_english_speaking_online_free_course.pdf
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fe8850b5e2b7.pdf
    • http://rotixumuzu.22web.org/1733894249.pdf
    • http://losiruwu.66ghz.com/path_traversal_attack_cheat_sheet.pdf
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/lodazad_rotagun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_862dd53a61ad4c068d54655e2b264269.pdf?index=true
    • http://pewojalosu.epizy.com/how_to_get_my_facebook_page_link.pdf
    • http://xatonidimo.rf.gd/eragon_download_epub.pdf
    • http://lufusemeg.epizy.com/63974159366.pdf
    • http://lepevalir.rf.gd/ivern_support_guide_s9.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d90d84394e9e4b29a1015b4d7dc6f03c.pdf?index=true
    • http://marivugedada.epizy.com/blackberry_torch_9860_flash_file.pdf
    • http://vigadibomo.rf.gd/do_you_have_to_take_a_vision_test_to_renew_your_license_in_illinois.pdf
    • http://dusutokoj.epizy.com/gemuneveda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f586.bin
235c39c0e41b7a779146869ad7f20ce366a1f0112721785aa455a0da58481976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 4512 bytes
font_01_sfnt_off000104cf.bin
a6e65addc8fd8f05853fe2e95bb22f1101f247d2808f2c6664d69fe582ebddc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 11096 bytes
font_02_sfnt_off00012ae2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 4324 bytes

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