Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3baa0b0c9ec6c…

MALICIOUS

PDF

86.0 KB Created: 2021-04-02 15:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6309b59436c08dcfcf7446cbf4562bd3 SHA-1: adad14f9e8cdecd84e25a2e97fe81cbd8babcb84 SHA-256: b1b3baa0b0c9ec6cc0e88a130130fe89826004c020cd296d7ffba36f702e92ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent URL being https://ponafet.ru/123. Additionally, ClamAV detected the file as Pdf.Phishing.Trojan, and an ML classifier assigned a high probability of maliciousness. The presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ponafet.ru/123?utm_term=whatsapp+status+songs++in+tamil+video
    • https://cdn-cms.f-static.net/uploads/4416805/normal_60644f598d27b.pdf
    • https://cdn-cms.f-static.net/uploads/4392664/normal_6047f74d4929f.pdf
    • https://static.s123-cdn-static.com/uploads/4445334/normal_5ffb3e0cc1e56.pdf
    • https://cdn-cms.f-static.net/uploads/4384045/normal_604f5ce82aaf6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pasawe/what_is_acidic_and_basic_salt.pdf
    • https://s3.amazonaws.com/kakekojezutok/wubokepatorufibire.pdf
    • https://s3.amazonaws.com/pidufozu/breakfast_at_tiffanys_quotes_about_love.pdf
    • https://s3.amazonaws.com/fumiposamisur/landscapes_review_final_report.pdf
    • https://s3.amazonaws.com/nafoxuda/ziripelaxikeberififala.pdf
    • https://s3.amazonaws.com/fuvidokibet/cub_cadet_ltx_1045_replacement_engine.pdf
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_23a32eca001d48c5af8bbbb902229502.pdf?index=true
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_0a9b991c569e412bab1252cb48916959.pdf?index=true
    • https://s3.amazonaws.com/subopukomanaw/esports_jersey_template_psd_free.pdf
    • https://s3.amazonaws.com/tojazudibumogab/elementary_differential_equations_and_boundary_value_problems_boyce_diprima_solutions.pdf
    • https://s3.amazonaws.com/bogeguva/el_principito_book_online.pdf
    • https://s3.amazonaws.com/pululusodogi/catapult_king_2_hack_apk.pdf
    • https://s3.amazonaws.com/nodetuxapabara/mathematics_activities_for_elementary_school_teachers_answers.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_cedf9e006cae4302a39d59e18911d606.pdf?index=true
    • https://s3.amazonaws.com/gedimuta/sekunizezevurama.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/horse_games_pc_full_version.pdf
    • https://s3.amazonaws.com/ditiruz/dipizaxubepupawez.pdf
    • https://s3.amazonaws.com/fumiposamisur/23626808738.pdf
    • https://s3.amazonaws.com/vatakefojunib/mexelapajuneje.pdf
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_09632c4a5b704fd28b67863fb184e6ef.pdf?index=true
    • https://s3.amazonaws.com/novifamigot/rufika.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadf.bin
4978cc324b2a52a4cb07b054a6deb7d6468ca91a7c156f589b2093218f82f54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 5348 bytes
font_01_sfnt_off0000fcf6.bin
2777b3ca6553709d88db32224daeeecd1f0b36bb5498f12dccdda749b332da69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 5164 bytes
font_02_sfnt_off00010f2d.bin
b743054a71c07eb02ca981946a587e9e0b45f28455b7a067bd4f27c4efad9571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 10940 bytes
font_03_sfnt_off000133e0.bin
a8f82ce1cdc57d6cf73caeb35ba0a534b8f114798d4dfc5d6ed82df03316e49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133E0 16384 bytes

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