Malicious PDF — malware analysis report

Static analysis result for SHA-256 2243b8130e8571bb…

MALICIOUS

PDF

85.9 KB Created: 2021-03-28 07:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e7d20c469b515988de2cf1c2a0ab1fc SHA-1: 14e79ec12e43376bfa43391fef64117afec11fec SHA-256: 2243b8130e8571bbccc25f3f7004c8fd7deca8bd54765614abc2c10e88050d08
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://bologen.ru/award?keyword=ley+de+defensa+nacional+argentina+pdf', is designed to appear as a document related to national defense, likely to attract clicks. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/award?keyword=ley+de+defensa+nacional+argentina+pdf
    • https://cdn.sqhk.co/xejudawadoni/MHheij6/8755290428.pdf
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/573177f1c662b3.pdf
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/2861794.pdf
    • https://cdn.sqhk.co/jomonufo/cJshgfL/43733400333.pdf
    • https://cdn-cms.f-static.net/uploads/4455375/normal_6041843a845fb.pdf
    • https://cdn.sqhk.co/gefeloxo/hiegf0F/88502158165.pdf
    • https://cdn.sqhk.co/fopajuxalaso/hf6Ciif/arrow_down_and_right_symbol.pdf
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5ff85a55b4d42.pdf
    • https://cdn.sqhk.co/mudebijutene/hiIijjS/basanotujuxox.pdf
    • https://cdn.sqhk.co/kojetovukufo/bggignq/tap_the_frog_doodle_play_online.pdf
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fca4964aff0e.pdf
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/cf18d12fb418311.pdf
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601d0de77539b.pdf
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/80ab20e9.pdf
    • https://soxajerufoxizas.weebly.com/uploads/1/3/4/8/134880654/df1e9cb285978.pdf
    • https://cdn.sqhk.co/jefapukawore/gc4ICjd/xezigosa.pdf
    • https://cdn.sqhk.co/dijogiper/iaNhhbM/english_action_video.pdf
    • https://cdn-cms.f-static.net/uploads/4465556/normal_60381cd1cfade.pdf
    • http://dawavuwera.22web.org/267173901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kubosew.epizy.com/livro_plantas_alimentcias_no_convencionais_panc_no_brasil.pdf
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_ca7745127fab4489a581138ba5f5036d.pdf?index=true
    • http://dimegebewode.epizy.com/14127677767.pdf
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_dc79581727f540edb310772753e5d961.pdf?index=true
    • http://munogotisun.epizy.com/how_to_be_an_internet_millionaire.pdf
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_4085dba87cfb43dfa641c075851a35c3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022b.bin
df645c02fbb7deee21a785bfa976d6f8a25cb19799e0f4ef2483468b3d7a8bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 5156 bytes
font_01_sfnt_off000113cc.bin
b2669960ec3f0e39b7afaa2883f6c70bb675dea462423da2b00d64a8c4ff3a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 13080 bytes
font_02_sfnt_off00013dae.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAE 4324 bytes

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