Malicious PDF — malware analysis report

Static analysis result for SHA-256 af797b4751f1548e…

MALICIOUS

PDF

92.4 KB Created: 2021-03-21 00:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a38e54feba58788ce4a0345d34d231 SHA-1: 5f079a991890da656ca3b5fdf8461b76476bfb33 SHA-256: af797b4751f1548ea458bb9f0329f8a26e69dd0d8da59ece14467de595b49ca7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious URLs like https://mezovuduw.ru/aws?utm_term=nutribullet+magic+bullet+blender+review.

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://mezovuduw.ru/aws?utm_term=nutribullet+magic+bullet+blender+review
    • https://cdn.sqhk.co/rajemaramiw/icHjegc/taxi_car_game_2020.pdf
    • https://cdn.sqhk.co/bivuwusim/eVqjgiT/95520323547.pdf
    • https://cdn.sqhk.co/tusumawibe/jCFifji/night_sky_map_app_android.pdf
    • https://cdn-cms.f-static.net/uploads/4408186/normal_6030cb1da4362.pdf
    • https://cdn.sqhk.co/rizijuwet/vsQien0/united_plus_points_chart.pdf
    • https://cdn-cms.f-static.net/uploads/4458628/normal_602871472c8a1.pdf
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5fed3c4c1e7dc.pdf
    • http://dubulus.iblogger.org/femojupepudakilonijofol.pdf
    • http://bubuletigesin.iblogger.org/91693067526.pdf
    • https://cdn.sqhk.co/lepudijazur/hhvCa1W/maze_king_eternal_monarch_lyrics.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_4ba3c6f57a7b47e5afe564c4d122610f.pdf?index=true
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_703068eaefa345f397ccf9c9d0528025.pdf?index=true
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_dc0d870578a44de08a755bcb33e03efb.pdf?index=true
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_7a803d3384564c218cab4b4efdde78c0.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_ed78e2ac549144d78bf0274cc2f9ad33.pdf?index=true
    • http://janosunitemixe.epizy.com/ac_dc_ballbreaker_album_free.pdf
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_7613e8c498a743cf8fe0886820025c9c.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_15d45b305eac41be842be85252822f4c.pdf?index=true
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_9062339e8e8943ed9386e33559ea49aa.pdf?index=true
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_ede4cb9b40f446ffab78d6be389a7a41.pdf?index=true
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_81610bd540644fbbad462a008053ba87.pdf?index=true
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_3f3237fa9a4642168d58545000e8e851.pdf?index=true
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_335fc2d7b45048428b574f770c090c46.pdf?index=true
    • 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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011434.bin
649c0d6301e2c2a8adc0fc84f5bdbfbd4cdfdea3acac1acf1eb3807e783d8572		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11434 9012 bytes
font_00_sfnt_off000102eb.bin
6b4661473823438b118e76a88b6eb5df0603a738e950ae87eadd754ded24b540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 5116 bytes
font_02_sfnt_off00012d67.bin
4c5e163a20b8ecf0081201db44076f5d4e2f8c21f1c9dd0efb35be50dfe673b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 11320 bytes
font_03_sfnt_off0001539e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1539E 4324 bytes

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