Malicious PDF — malware analysis report

Static analysis result for SHA-256 be87b2b4e9706148…

MALICIOUS

PDF

71.9 KB Created: 2021-03-28 06:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b538c770369c555b504d6ed9ae5b1619 SHA-1: 5f15121cee0ec5814104b83c28222157ea09be17 SHA-256: be87b2b4e9706148654fae962d03a5af9007079cc304cb30bc6a4e59955a62eb
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of these URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=two+rivers+disc+golf+course+nashville+tn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602025c63ef7e.pdfIn PDF document text
    • http://predouche.xyz/gikudivopokijofhgo7.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/jf4hzAQ/duzolu.pdfIn PDF document text
    • http://stav-games.ru/download_faily_rider_mod_apk_versi_terbaru_20201w0nm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_60012dd01bb97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5fd8b379e6936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_60206e652ee4b.pdfIn PDF document text
    • http://kvyovk.xyz/vebakozivisojewavtx62h.pdfIn PDF document text
    • https://cdn.sqhk.co/ziwetuvije/jjcgfGw/google_map_in_android_studio_example_code.pdfIn PDF document text
    • http://shimano-stradic.ru/24258441048gp77i.pdfIn PDF document text
    • http://remontvorot24.com/cuisinart_bread_maker_recipes_cbk-110nirvi.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/hagdgjy/9296602601.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/MhifD25/rock_pocket_mouse_activity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_6015a411d313b.pdfIn PDF document text
    • http://levantegroup.net/71209785334935k2.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/iehbjdl/rifedidediletux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_60507d771ffe5.pdfIn PDF document text
    • http://toppiksnack.xyz/how_to_clean_vicks_warm_humidifier6wn6e.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
    • http://nadanopo.rf.gd/bawutimi.pdfIn PDF document text
    • http://bedegotix.epizy.com/11330643569.pdfIn PDF document text
    • http://bosirizowu.rf.gd/5003760223.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_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 5268 bytes
SHA-256: 6bcd69d48f9104be73397c8a21a8fddaed105b894e32d4fa6e986a74b1e1994a
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 10456 bytes
SHA-256: 0bb735dc8b4a913053a7e2efbee73eb6f0ccf5f8e1453d1239fd79e6a1c0bd87
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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