Malicious PDF — malware analysis report

Static analysis result for SHA-256 b996d20001fe39ac…

MALICIOUS

PDF

111.5 KB Created: 2021-02-28 17:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1bc6aae75d455b29430e1566aeeb414 SHA-1: 0e8aae0c4b58d248a1a4235320fdaea1565f7bb7 SHA-256: b996d20001fe39ac8efe7d410a74f4bdb9de336322366ee8b6eef2aaa1f432cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of external links point towards a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=george+foreman+net+worth+2017 PDF link annotation
    • http://antonioit.space/midasorirutovowusor9og98.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/hahahjc/20310661368.pdfIn PDF document text
    • http://thecabinets.xyz/514834732170u7u6.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/toto_aquia_iv_washlet_s550e_review.pdfIn PDF document text
    • https://tureduritisamo.weebly.com/uploads/1/3/4/6/134676104/masilenumonopu.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/dusuvemapa.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/iEMFghT/the_vikings_cast_season_4.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/ihZaiaU/hungry_fisherman_restaurant_john_s_pass.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/161043.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/b8Ojcrt/best_stories_to_tell_your_crush.pdfIn PDF document text
    • http://titonevaj.22web.org/29949499340.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/alice_bailey_books_amazon.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/jalte_badan_movie_song.pdfIn PDF document text
    • http://delayikapy.xyz/12624859388ry0ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fc7a43082b55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://farilofisimoru.rf.gd/95942043201.pdfIn PDF document text
    • http://botetuvixomidiz.epizy.com/29419100220.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/panolinukaneluwudu.pdfIn PDF document text
    • http://balazetesu.epizy.com/janitza_umg_511_datasheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C5 5500 bytes
SHA-256: d20dd3047a461fcba2275ce83d98ffdeaf47242c8787663b1e17809d346d7136
font_01_sfnt_off00018b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B73 10872 bytes
SHA-256: c869c6979afa48d4466c78eaa052cbb4efb43d44676456ce484a4caca6b633c0

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