Malicious PDF — malware analysis report

Static analysis result for SHA-256 38524c72e9b9675f…

MALICIOUS

PDF

82.4 KB Created: 2021-04-17 20:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e365c0950c671455290f83a2c8016133 SHA-1: 22a320eddafbf3d5852292ea0f65b206e52a5321 SHA-256: 38524c72e9b9675f8ced9a0f391a088089417ea499973ac4ec4ede5c68039eb6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=bosch+nexxt+100+series+washer+will+not+drain PDF link annotation
    • http://art-practice.org/bazaar_movie_songs_320kbpswilxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_60149fdc9568f.pdfIn PDF document text
    • http://excschool.ru/xamilixikorazudmm1ip.pdfIn PDF document text
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/tenimamoratal.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/geraf.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/napupudewonak.pdfIn PDF document text
    • https://xaledojasuk.weebly.com/uploads/1/3/0/9/130969600/tuxiwotalojuno.pdfIn PDF document text
    • http://abwaab.su/xarelefodevidesux8zmfl.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/dexojivutowixosafo.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/31695457209kvu2y.pdfIn PDF document text
    • https://wademaleg.weebly.com/uploads/1/3/5/3/135346716/521671.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/68265845836.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/how_to_dye_the_tips_of_your_hair_with_splat.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/mowelafasulogamuxojez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489028/normal_60359debe8d99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupizamowakop.myartsonline.com/analise_de_dados_e_estatistica_descritiva.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_9471a70d0f594a019064cbe5c5791318.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_38076a142f7f41ed9ec168e92946f8ec.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_10a8a6104d1c4fcaa814f243fb2ed20a.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_2216282eb6334ef7ad8be641c7ece669.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_1698b62ffba64e44bbb407c45e23a5bb.pdf?index=trueIn 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_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 5428 bytes
SHA-256: 4d0684c7d8d06c89b3a009ac12ad5594033c0215c854fade5f8c0089898728db
font_01_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 11500 bytes
SHA-256: 82aa7f78b6ed688fd008cb84957180018d2086a6eabc181d4408c8a2335cb326