Malicious PDF — malware analysis report

Static analysis result for SHA-256 8181f43038ca3877…

MALICIOUS

PDF

81.8 KB Created: 2021-03-06 19:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f85d0106e92d2256b2d9e0a7e926fd75 SHA-1: 87d365b453ef1615cfd98ae337020d3677aa014f SHA-256: 8181f43038ca387718a5cff81a7581ab2580ba6503db9e75117f61ccccc32ef2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://bologen.ru/123?utm_term=thermo+king+stock+ticker', suggests a potential lure related to financial markets or stock tickers. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=thermo+king+stock+ticker PDF link annotation
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/fadolivawudelawem.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/PMjbb62/1830177740.pdfIn PDF document text
    • https://cdn.sqhk.co/rufigukuj/R45HXJt/2_guns_movie_star_cast.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/what_to_do_with_secret_seashells_links_awakening.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/QgjZigt/3318630078.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/8700282.pdfIn PDF document text
    • https://tiwavejesuma.weebly.com/uploads/1/3/2/6/132681866/boput.pdfIn PDF document text
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/muresegizane.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/cUjehh6/playbox_apk_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/iihigiP/sivapegeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_2c8ab284c61b47f69cfe8629d21a6624.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_a3c1e03394a04b4995095849d3ffc05d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3560605c-2fa5-4721-bdbe-f1686ca6f8d1/dd_5e_warhammer_versatile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8040af0-535b-46ae-9daf-4fcc07f5a1ac/jirip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713fcd3d-b6b9-4024-b58f-984850534deb/44675800626.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_7de03a910093439ab0d5655eb9e98f07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b2fbff-9742-4644-ac2d-de09d4baa44f/42152353996.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_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 4984 bytes
SHA-256: 20fb70e67c4fa3a78803d6b9eb8837b4643096b6e5061355fd3acba4bd70564e
font_01_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 11372 bytes
SHA-256: aab4884e6652df067bc49b72a030b7752f4d3daf20fb40c8d977e070a0c38448

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