Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127ff91a534cf06…

MALICIOUS

PDF

86.3 KB Created: 2021-03-04 04:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91c204ae5332fc9494058bf4836fe7f SHA-1: 90f937695731d506f0a79c531ccd2ad86e08e83e SHA-256: b127ff91a534cf0682fc9ef43c8c800867a00337d0d41148cf2c456e577b5236
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru' and including a search term related to charging earbuds, suggesting a phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score further indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=how+to+charge+merkury+wireless+earbuds
    • http://ezfix.asia/pifozinadatogiz37y6.pdf
    • http://dehydratedoriginalgoodness.com/mental_status_exam_questions_for_dementiabg4sx.pdf
    • http://habercigo.com/what_is_the_theme_of_the_book_flowers_for_algernonh1d11.pdf
    • http://maddot.space/607840948951y53q.pdf
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fed732652761.pdf
    • https://cdn-cms.f-static.net/uploads/4454550/normal_6019d8d1d0ea2.pdf
    • http://money-team.site/675981945734iwf9.pdf
    • https://static.s123-cdn-static.com/uploads/4464863/normal_5fee1ae81be72.pdf
    • http://probkin34.xyz/cangilones_definicion9kfxm.pdf
    • http://sungo1.space/wotamadipazog10myn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazorixekunafob/43354951527.pdf
    • http://robefopatobut.epizy.com/manualidades_navideas_en_foami_gratis.pdf
    • http://fixelelediv.epizy.com/88452130257.pdf
    • http://tivogowajap.epizy.com/88611664435.pdf
    • http://suferipuwa.epizy.com/chain_of_infection_ppt.pdf
    • http://rotaduwifomol.rf.gd/66124184564.pdf
    • https://s3.amazonaws.com/rorives/fulupomekorogibu.pdf
    • http://ziwebizivag.epizy.com/online_any_video_er_chrome.pdf
    • http://pirozaja.epizy.com/dongri_to_dubai_marathi_book_download.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_off00010d74.bin
9bf461aa69b53f8b5e85a6a943d04de73ae8f03c408ca98de37a52806979be16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 5712 bytes
font_01_sfnt_off000120d4.bin
407f7d5e64262ccbf5d9ee78245c73f3ea7dd727b6c9797a34506bae8eb4ed9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 12828 bytes

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