Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa895c303c198fd…

MALICIOUS

PDF

118.8 KB Created: 2021-03-28 08:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8994db9dd43feab23b8fdc3045c163fe SHA-1: aa6d06910d9b2805caa66ed2b7a297e9345bfd6b SHA-256: baa895c303c198fd9cf48556e24f47c729c523b0ee5bcef7f1c87ea309701989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a link farm or phishing lure. The presence of numerous links and the PDF's structure strongly indicate an attempt to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/123?utm_term=kala+patthar+movie+song++pagalworld
    • http://instapriz24.online/savarese_omt_review_4th_edition_free73g3r.pdf
    • https://cdn-cms.f-static.net/uploads/4445320/normal_603e5f6cf3c83.pdf
    • https://cdn-cms.f-static.net/uploads/4405650/normal_60311d913f237.pdf
    • http://kamini33.ru/15474814017naodn.pdf
    • http://lyudi23.ru/parallel_space_64bit_support_1._0._3042_gg_signed._apkfqdt3.pdf
    • http://tawokurabugo.22web.org/inverse_log_button_on_ti-89_titanium.pdf
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5fe562150859e.pdf
    • https://cdn-cms.f-static.net/uploads/4411490/normal_60167822b4b53.pdf
    • http://ceter.xyz/dewolcar42.pdf
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600c090a4295c.pdf
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5feb60616fb2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puganuditefi.rf.gd/how_to_reset_lg_bluetooth_headset_750.pdf
    • https://s3.amazonaws.com/legipalofi/3575963529.pdf
    • https://s3.amazonaws.com/lebaxa/ledudeg.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_1304cc94975d4c5cb153bab668dc8a08.pdf?index=true
    • http://gejujebiwibi.epizy.com/cerita_silat_bu_kek_siansu.pdf
    • http://zelafofavelak.epizy.com/18023177625.pdf
    • http://rukojipunuwupur.epizy.com/poverty_reduction_strategies_in_south_africa.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_d6b3f34623424f7494918ad873e0f8b0.pdf?index=true
    • https://s3.amazonaws.com/voxazedisula/how_to_overcome_depression_at_university.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f7d.bin
0864eaf3a4bd8d3d34dd21b96b4c93a5051e7e85e779bd62f8b257d72c2a0826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F7D 5492 bytes
font_01_sfnt_off0001921a.bin
defbdf1394667770aad7547e9a32d94d5cfbfe6655c7ab69626340eea2525f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1921A 11176 bytes
font_02_sfnt_off0001b876.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B876 16164 bytes

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