Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f333023e9a0f502…

MALICIOUS

PDF

47.5 KB Created: 2020-10-29 12:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 588677100f329630b08b9f87c3317ebc SHA-1: 244acdb69f7d4d0a76e8975894d2db0bb811903c SHA-256: 6f333023e9a0f50289415cf2b6bcc414c1bbb1de0bf1f3ed9b92d2e15e0d1c36
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=worksheet%20pdf%20clothes In PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/lafulovenege-nixirexo-vorabereb.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/zakadox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f8f170a8b6e5.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/2497d6976cc36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f9a1860516dc.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/linemufe.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/4897235.pdfIn PDF document text
    • https://pufibifisap.weebly.com/uploads/1/3/4/4/134450659/narapebigafiberi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f92cb16e0233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9654/8530/files/knowledge_transfer_template_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a02536-0678-4601-b8fd-a10708d3aa30/k7_antivirus_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501dfbc2-7bef-4a19-8670-9e3f158612f4/40696185666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6088/7193/files/68620320414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3239960f-f3a6-4deb-ac66-4eca74dca88d/xusesisijakuwinuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7485/1494/files/vuwopopox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400cbc83-7b54-493a-9e9a-3ecc7289ce2a/sekaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cd40f4-0d21-4382-9ba7-22f9e6229259/xitizolibiloxupuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d94e1df-e566-4846-ad4a-7882deb2de21/solidworks_3d_drawing_for_practice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0136/3619/files/26623290142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f15f8c6-f1d0-4ae7-97c2-36ba6b3f49bc/22114250360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4235ef-ebf1-49e0-8caa-c9de2a50d3ec/lezoxamana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c0a5db-5eef-47e1-bc26-dc9dc1b512c3/puvisadodir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8392/6171/files/identify_the_type_for_each_quadrilateral.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_off00007be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE8 5108 bytes
SHA-256: d5be29a916c3aa09887f29ca9b7b916bd29852208f77f9ee2a9ac53fc981285e
font_01_sfnt_off00008d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 10440 bytes
SHA-256: 54fd694fdbd1a30f87d04ffe1d703efdc6c64f8ec61f6c36568d958d12ba7e12