Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efb4a2b78a03d0f…

MALICIOUS

PDF

69.4 KB Created: 2021-02-23 16:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b3ca63aee0cb7d4664ab8c28c825d1f5 SHA-1: 643618fc753ac765344f3a986974a8b5d71e1394 SHA-256: 8efb4a2b78a03d0f2175a55d6eb0d2a76c5375a285b608462d82413e7aaac702
226 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/123?utm_term=how+to+do+p90x+without+equipment PDF link annotation
    • http://shoppingyxplus.xyz/16387118053wldpy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373239/normal_6001d49dc111a.pdfIn PDF document text
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/jujukavan.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/f53b9d67a15909.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/8052305.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/lufiga.pdfIn PDF document text
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/4b542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_60171b2bdd6d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ff7bb53179c2.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/22b3712f.pdfIn PDF document text
    • https://gonelato.weebly.com/uploads/1/3/6/0/136082396/e3663315e41b0.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/how_many_gold_rings_does_it_take_to_get_100_smithing9gqtk.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/5669878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fd7bd0b1ada7.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/xasemurezexufelopuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_6026f5cc5e8c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 5228 bytes
SHA-256: 249895b79a92312538606dff751448d00235ecc7a0ea344503572e1a8acc40c0
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10460 bytes
SHA-256: db5d89c62fe9eadbf9d5bbdfd876a66a2080b671c37fdf485bbab321cb5d9172

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