Malicious PDF — malware analysis report

Static analysis result for SHA-256 1797aa04f3fbcb9d…

MALICIOUS

PDF

85.1 KB Created: 2021-06-04 15:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02e6ad4ad40516dbe2ee00875310c265 SHA-1: e4705821942e410159196f256b56917cdf45e9d6 SHA-256: 1797aa04f3fbcb9d18ec741bf51628864061567b913ab9f6c77bd8cf6f1ecae1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/123?utm_term=mahesh+babu+new+movie
    • https://static.s123-cdn-static.com/uploads/4370076/normal_5fcc366c2d754.pdf
    • https://cdn-cms.f-static.net/uploads/4421767/normal_6024066d9d952.pdf
    • https://cdn-cms.f-static.net/uploads/4450631/normal_6062445904bb0.pdf
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/1a2170f15322.pdf
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/2180933.pdf
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fe90bf246caf.pdf
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/3936603.pdf
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5ff8b8f61a8c1.pdf
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fe08fc65bb46.pdf
    • https://cdn-cms.f-static.net/uploads/4385230/normal_6048e16644b77.pdf
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5fe52e908817f.pdf
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/vefob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tebejeloxid.pbworks.com/w/file/fetch/144424002/55442662685.pdf
    • https://uploads.strikinglycdn.com/files/36fec09b-ece6-4476-b4c8-6ab73b4f058b/baby_rudin_chapter_5_solutions.pdf
    • https://uploads.strikinglycdn.com/files/4855ac83-2f78-45e1-96de-1fa295f1d416/what_are_the_functions_of_windows_operating_system.pdf
    • https://uploads.strikinglycdn.com/files/2f2fc2b5-4e35-4399-8c42-1c72fb5d7f32/manhattan_tattoo_show_crossword_clue.pdf
    • https://uploads.strikinglycdn.com/files/a9756234-b6ac-4a9e-82b5-68dfb1264e84/70900375257.pdf
    • https://uploads.strikinglycdn.com/files/8d256095-1c3d-4770-98a6-93cf0ae22789/natural_ways_to_draw_out_ear_wax.pdf
    • http://gexufak.pbworks.com/f/reritodejudetatofip.pdf
    • https://uploads.strikinglycdn.com/files/4c2236e1-960f-42ea-9b69-54a517e3371c/ludamude.pdf
    • https://uploads.strikinglycdn.com/files/d9b15baf-a3b3-4e11-af7a-2c749e1b0ce6/buddha_and_his_dhamma.pdf
    • http://zewalar.pbworks.com/w/file/fetch/144466641/descargar_minecraft_pe_ltima_versin_2020_para_android_gratis_1.16.20.pdf
    • https://uploads.strikinglycdn.com/files/e9e040c7-064c-4ad2-82fd-db2a276e5b8c/how_to_remove_bobbin_from_bobbin_case.pdf
    • http://werinenimuta.pbworks.com/w/file/fetch/144498900/sketchup_pro_2020_manual.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_off0000f907.bin
44f73e27bb2068656c287e77c87b5f2ab3821aeb8cbddd0abe1f0cce3e8d665b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 5092 bytes
font_01_sfnt_off00010a57.bin
7a24cc8ed627f2d39617c54ecbdf4781d781606bd7323a6ab2797dc7324be563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 10964 bytes
font_02_sfnt_off0001301b.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16164 bytes

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