Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7c1b7d678ab8ad…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 01:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81e1e010006e767206aecfbcb22790ce SHA-1: 6c15b9dfa7b76bb3f25c5d0eaafd4b848e4c9d66 SHA-256: 1c7c1b7d678ab8ad2d961b48ced651c9a0181f45c8f32ca2e80d527f5462c6b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are designed to mimic search results for academic content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=world+history+chapter+8+section+1+assessment+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419415/normal_5fdb52dd4e63f.pdfIn PDF document text
    • http://naykaryadom.fun/atrial_septal_defect_adalahix8uh.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/texas_state_holidays_2021_comptroller.pdfIn PDF document text
    • http://magnifioco.site/81416368237i1xly.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/h4ujphj/mccpilotlog_to_crewlounge.pdfIn PDF document text
    • http://komarovskii.xyz/sekozodijamagilubuvasuxczb4t.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/hZjcOz2/day_r_premium_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_60402d6a79441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_600f2ead7eb1c.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/bBOijjj/75852981630.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/hgihuai/amazon_music_hd_vs_spotify_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386822/normal_5fc6459795f59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5fecd4f4eaa55.pdfIn PDF document text
    • http://hookup154.online/9925448569ihevy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/paxuvagal/vubumepobivowofokaxom.pdfIn PDF document text
    • http://bekapoza.epizy.com/94031114960.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/heaven_on_high_floor_30_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/difference_in_fluid_dynamics_and_mechanics.pdfIn PDF document text
    • http://jabenesejamuji.rf.gd/72138485346.pdfIn PDF document text
    • http://sifepati.epizy.com/aurora_rising_epub.pdfIn PDF document text
    • http://puvewidu.epizy.com/morfologia_de_los_nematodos_fitoparasitos.pdfIn PDF document text
    • http://mawebiruna.rf.gd/gexogabuduw.pdfIn PDF document text
    • http://pidusuzelaju.epizy.com/70509308263.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_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 5552 bytes
SHA-256: 11194fa2d1f95129ac2c56e4445ad436a20ef8d90311a277c7be8e2c0e494600
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10804 bytes
SHA-256: c7b3015716ac8f1e2588e66a9280eab77883458c75eb45f4256a81f93faa1afe
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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