Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec9b05dd520d790…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 00:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 704e7f6cd31ccb5b39897adfa1b398ad SHA-1: e6834ea6674d3d8ecea63fc50e11f8f09e1465b8 SHA-256: 6ec9b05dd520d790977e49ddc71831d71214057b292f6f3a674aa95c4045e6e3
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically targeting a URL related to 'private navy salary', suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=how+much+is+private+navy+salary
    • https://cdn.sqhk.co/nasubivapu/lUhdzgi/meput.pdf
    • https://cdn.sqhk.co/repudodo/f37jeOg/bebetazoluvelemo.pdf
    • https://wowajonaj.weebly.com/uploads/1/3/4/7/134717857/2064477.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd95e5a4d4fc.pdf
    • http://zunuruxeguxifi.mygamesonline.org/how_to_draw_human_in_perspective.pdf
    • https://cdn.sqhk.co/duvetezoje/M2ifEgc/friends_justin_bieber_mp3_download_free.pdf
    • https://cdn.sqhk.co/rasetiwulipu/cthbjgx/pull_him_out_game_levels.pdf
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ffa3fbd817e3.pdf
    • http://pojokup.getenjoyment.net/rimapogovafiva.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fd1bbe05a272.pdf
    • https://cdn.sqhk.co/kuzaxepigi/jnEijZ3/defender_110_hse.pdf
    • https://cdn-cms.f-static.net/uploads/4463792/normal_603b8f4601910.pdf
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/lezibepiwamojo-vawezojolisejib.pdf
    • https://derufobi.weebly.com/uploads/1/3/2/6/132682106/gopuwabegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jarawaxanivu/66990355647.pdf
    • https://s3.amazonaws.com/niporofez/codigo_nacional_de_transito_colombia.pdf
    • http://disiroto.epizy.com/1988_bayliner_capri_cuddy_owners_manual.pdf
    • http://dogazuzi.epizy.com/mobomejuwapi.pdf
    • https://s3.amazonaws.com/juwofuxufijup/t_shirt_template_illustrator_blank.pdf
    • http://sanejiwobar.epizy.com/modern_aldol_reactions.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f8.bin
eb1b858b90dce09a70d10ccc82f5f4024088e10ecc854b56b7e4011d48b9d8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5388 bytes
font_01_sfnt_off0001033a.bin
2245e6963c4b2edda6cc1988eb457d83beffa589e28fdcb9816c885487e57659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10568 bytes

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