Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e022549b794c5f0…

MALICIOUS

PDF

86.4 KB Created: 2021-03-29 08:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269bb5e1d00bf89b829b8ac4a246d523 SHA-1: cac8c4c83de0be532f3c2e9da4ada1644be3369a SHA-256: 7e022549b794c5f053bd513d53f15581da1ec343f5229758f6ca66f70c59e1cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL pointing to 'jumiwimov.ru'. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_URI', suggesting an attempt to generate traffic or redirect users. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a lure related to 'plant ecology pdf book'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=plant+ecology+pdf+book
    • https://cdn.sqhk.co/ranetixeba/hdgd0jb/21537548964.pdf
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/c9a3bd2.pdf
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/1263844.pdf
    • https://cdn.sqhk.co/remigalakefo/hih24id/jamey_johnson_farm_aid_2020_songs.pdf
    • https://baxikulalul.weebly.com/uploads/1/3/4/5/134582220/vamefekawanob.pdf
    • https://cdn.sqhk.co/dulunukosep/2qihajo/tiwotofigefinategif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11defe5d-c788-4083-a481-c06efcf90bac/uncommon_genetic_traits.pdf
    • https://uploads.strikinglycdn.com/files/a155711f-1ed1-4a48-a500-9ecacc4ca688/22791916752.pdf
    • https://uploads.strikinglycdn.com/files/6dd09ba8-f4a8-4488-ac67-52b54db5a78e/ny_drivers_permit_practice_test_online.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_adeff33102ad45a0a9c7a05035e819ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ab1aefa-5e91-42b7-aa73-1956d1287d28/linear_inequalities_worksheet.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_77f916001a1e466f819da354ade0faec.pdf?index=true
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_f1156b8d56b747619e9955e375cf87d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8330faee-36fc-478b-8dc5-41712dc87a2b/the_48_laws_of_power_download.pdf
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_99bfa3ae1aab45528f282cf3dc9e264a.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_2099e37e2ced4849a94ce37d4a7d5328.pdf?index=true
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_c3ac5a3c5cf140b4aa89c0ae2606a8e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb5a91e2-32b1-435b-a383-2d738c5c4641/what_was_true_about_the_brown_v._board_of_education_decision.pdf
    • https://uploads.strikinglycdn.com/files/3ce18444-6309-458d-8157-06d8bd54261c/ligitojuxonigibuvoloju.pdf
    • https://uploads.strikinglycdn.com/files/64f2a176-429c-4e40-86f6-9505ce5ab6cf/86524277999.pdf
    • https://uploads.strikinglycdn.com/files/a7b44a18-e54b-4bf1-8823-3dca41bbcf7a/blockchain_tutorial_free.pdf
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_5de145db70614833b0132cd457ccec92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b46fec6f-0ab1-4753-882f-e7440b8549ca/what_are_the_purposes_of_social_science_in_our_daily_lives.pdf
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_da204d03913c4634ab0cb612829e3364.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113aa.bin
7c6356534e41ea335861a6540a026d335ee8b0fef5b432d92b35afb9d9fb9624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 5356 bytes
font_01_sfnt_off00012604.bin
8c8bb04bee78712b47d2cc7d58f8ceb70049afb04168e8df79e0f516849a70a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 11560 bytes

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