Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da254b3d3c6d58c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-05 07:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 67f2613fd1a44cd31a4d33c2fed17bed SHA-1: 4994c67fcacf6ea9245e7239151cd380dbe299fb SHA-256: 5da254b3d3c6d58c8f00e4eebfada8a56ee8623d646409bc3d59f47c5975f9ae
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting sites, characteristic of a link farm designed to host phishing or malware distribution pages. The primary URL, https://inwebjor.ru/pbw?utm_term=achyutam+keshavam+krishna+damodaram+female+mp3+song+download, suggests a lure related to MP3 downloads, which is a common tactic for phishing campaigns. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/pbw?utm_term=achyutam+keshavam+krishna+damodaram+female+mp3+song+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5ff97ff2c4492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_60473ded61bf0.pdfIn PDF document text
    • https://legopaxazomunan.weebly.com/uploads/1/3/5/3/135396831/fbb5e2b832f7f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60216fc389fa0.pdfIn PDF document text
    • https://pepulerizalumel.weebly.com/uploads/1/3/2/7/132740212/rovelenuniguxipaj.pdfIn PDF document text
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/mudubupewagubeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_60002de67f2b3.pdfIn PDF document text
    • https://nukijevexumi.weebly.com/uploads/1/3/4/7/134714394/af2b6a5bfe1781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_606455ea35f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_60394bc0bb488.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/vekaf-nopojugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_605fd2668aa7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fc9087ed9b53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144443151/how_to_empty_dyson_root_cyclone_technology.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/josepadekanawuxuzamigewi.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144515481/chemistry_all_formula_chart_jee_mains.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144636570/using_multiplicative_inverses_to_solve_equations_worksheet.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144562398/zorilabawupuwur.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/f/lumerewe.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144452871/pirates_of_the_caribbean_piano_sheet_music_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 6040 bytes
SHA-256: fd11ba138a71581e23dbd6b58080876a0a1f7f3300ece3cbde3c81c2247dfc95
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 11684 bytes
SHA-256: f69622f6d3914e1d38420e009fdf7bdbf1dbc1dc8b77262543755722d15734c2
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 2432 bytes
SHA-256: 35b388e8a7e2f15175d00deed095e3304b97f42c5f119e62a2fd42768d832f14