Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88f397b9b900bf1…

MALICIOUS

PDF

108.8 KB Created: 2021-03-20 03:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: af1c1c24c73fb581499cdf4d1669273d SHA-1: 4ee561ee678b10ab8a51251b6e29ef96db307382 SHA-256: c88f397b9b900bf10769fdbb02af94c5323084c62c63024e3eb5f1b8344b29ec
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though partially garbled, contains text suggesting a lure for downloading a book, and embedded URLs point to link farms on disposable hosting, indicating a phishing or malicious content distribution attempt. No scripts were extracted, but the presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=descargar+libro+los+protocolos+de+los+sabios+de+sion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fd794a7df503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_604dcae255336.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/7tozje7/vikings_history_channel_parents_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_6027330857b56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fdf81690f63f.pdfIn PDF document text
    • http://naturka.space/stock_market_breaking_news_twitterkvg22.pdfIn PDF document text
    • http://tevfikyuce.xyz/zisijifufexupebebexidewemspa1.pdfIn PDF document text
    • http://trysol.xyz/sesamofz1jgp.pdfIn PDF document text
    • http://vegavos.22web.org/4_pronged_approach.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5ff1dc9b018c8.pdfIn PDF document text
    • http://remontvorot24.com/app_that_answers_biology_questionszwlsl.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/fhiCuYv/79170191574.pdfIn PDF document text
    • http://fridgeservice.ru/407806257egiv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_603a7ec337cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5fd33014dae06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupopejif.epizy.com/are_dunkin_donuts_flavor_shots_keto_friendly.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6209de05081d4027b11a50009afe7fd2.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_68a316e3b4854238a46c964692e39898.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_df57324d88074b7da1798a6c962be38e.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_18cc117ad3d54c7a812981dab71a7fe2.pdf?index=trueIn PDF document text
    • http://xeladijigaw.epizy.com/38178058554.pdfIn PDF document text
    • http://zaluboxif.epizy.com/pdf_to_word_online_editor.pdfIn PDF document text
    • http://magivuxitafexox.rf.gd/alimentacion_enteral_por_gastrostomia.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_off000161dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DC 5380 bytes
SHA-256: 22877fdd6cecf74ef10b014e17a2f107287a0f559587f582d32df5ee7f15349b
font_01_sfnt_off0001742e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1742E 15720 bytes
SHA-256: ac5cd398056e2374dd5ddd2f3e3fd76ba45fa8e76d8e1d044ae83d7eaf886799

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