Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d7f2773161c89f…

MALICIOUS

PDF

109.1 KB Created: 2021-03-09 22:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9924164d68ae198ff7a94b895c7eaca0 SHA-1: 793f98709bed1a1099d3a1fb447f3d3fc1b14245 SHA-256: b7d7f2773161c89f49f77441f9ccdd10146cdd1739bf5e801de1420348cf71cf
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL that masquerades as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dugedepap.ru/123?utm_term=sql+server+profiler+2012++free
    • https://cdn.sqhk.co/gowamojon/hfyUrjf/jezulozatu.pdf
    • https://cdn.sqhk.co/nimuxugemu/QqcPjhb/dojafa.pdf
    • https://cdn.sqhk.co/mabisurud/ijOyhbQ/92277651402.pdf
    • https://cdn.sqhk.co/jidevumedure/jihbygh/vunoxivosakexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_8a33deeaabba4404a180b9d19d40e62c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/410e1488-6c6a-4f11-9b25-046f2f64d671/jopelarupavin.pdf
    • https://uploads.strikinglycdn.com/files/4c33a118-1a6a-457e-bec2-c41f9eeaa806/i_am_a_church_member_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/23972591-d463-4807-aefa-5f98a7905780/19376271492.pdf
    • https://s3.amazonaws.com/divelatoxa/jupiter_gustav_holst_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/d4f2cbbf-ff07-41c7-9190-a2cd11dcab07/58279902732.pdf
    • https://s3.amazonaws.com/zusevamasor/peaky_blinders_season_1_reddit.pdf
    • https://s3.amazonaws.com/nagudo/lord_of_the_rings_books_ranked_reddit.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_2cd44147cf9a43c09dd3c1e3575cfccd.pdf?index=true
    • https://s3.amazonaws.com/luramamelolem/nugexuf.pdf
    • https://uploads.strikinglycdn.com/files/e1d50622-8939-4768-8713-fb447515f00a/how_do_i_fix_my_jabra_elite_65t_left_earbuds.pdf
    • https://s3.amazonaws.com/gedexim/96201910925.pdf
    • https://uploads.strikinglycdn.com/files/ca40d991-c69e-4901-9d14-8829fad142d9/jezowo.pdf
    • https://uploads.strikinglycdn.com/files/a3524c69-3c9f-4eae-a85d-e5812af56d81/asp.net_core_video_tutorial.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_0e725c48ac4847e784aeeb01e5f4a18a.pdf?index=true
    • https://s3.amazonaws.com/wibedubosateg/pengertian_alkalimetri.pdf
    • https://s3.amazonaws.com/zifozujiwi/executive_summary_for_hr_project_report.pdf
    • https://s3.amazonaws.com/lewuli/49172716538.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013269.bin
a93321297984befb442c454f2d8debd7bc06ff07d5b55f749abd6959d7a3a45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 4904 bytes
font_01_sfnt_off00014322.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14322 1800 bytes
font_02_sfnt_off00014baf.bin
ce0c40b15d70e6a0ae09714867a0ff85b2767fba378f6aabdcbd0ea2bf007fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAF 17064 bytes
font_03_sfnt_off000180fb.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180FB 16096 bytes
font_04_sfnt_off000195c5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195C5 4324 bytes

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