Malicious PDF — malware analysis report

Static analysis result for SHA-256 35be2a161c3f97a2…

MALICIOUS

PDF

36.9 KB Created: 2020-10-03 08:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d2ae1cfbe386357494290d60b8ba3343 SHA-1: 94a18bf9003cd2ba6edf7fd950a03e0631f90dda SHA-256: 35be2a161c3f97a2c101264973b0e3b5a89dcce133448be5c0a1c9d5437bda41
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, indicating a link farm or redirection scheme. One of the primary URLs is identified as belonging to known malicious redirector infrastructure, increasing the risk of users being led to malicious content. The ML classifier strongly flagged this PDF as malicious.

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/strik?keyword=en+la+noche+de+los+tiempos+rodolfo+benavides+pdf In PDF document text
    • http://xizitojo.doolanchemistry.com/uploads/1/3/2/3/132302846/6b5dbfb.pdfIn PDF document text
    • http://files.vsenergy.us/uploads/1/3/1/1/131164250/latikajosev_tovukidobidav.pdfIn PDF document text
    • http://files.jinternship.org/uploads/1/3/2/6/132695668/e0d6e15d3d.pdfIn PDF document text
    • http://files.sitesbydane.com/uploads/1/3/1/4/131438002/1930277.pdfIn PDF document text
    • http://files.stickystripz.com/uploads/1/3/1/3/131380728/reritejetiselim.pdfIn PDF document text
    • http://wekezitu.annagalatirealtor.com/uploads/1/3/0/8/130814297/2260696.pdfIn PDF document text
    • http://xezajud.leeannevernon.com/uploads/1/3/2/7/132741136/xilurixirunesijuja.pdfIn PDF document text
    • http://files.qclahotels.org/uploads/1/3/0/7/130738641/kijilu-bawebadet.pdfIn PDF document text
    • http://gaguxamep.fleurspressed.com/uploads/1/3/2/6/132696067/4703236.pdfIn PDF document text
    • http://files.bodycodehealings.com/uploads/1/3/1/4/131453248/7291675.pdfIn PDF document text
    • http://files.peoplescompanylondon.com/uploads/1/3/1/8/131857270/vuxax_silolu_dinavimilarap_wobarovuwig.pdfIn PDF document text
    • http://files.mahiora.co.nz/uploads/1/3/2/7/132740978/biperufi.pdfIn PDF document text
    • http://files.pickyreader.com/uploads/1/3/1/8/131856318/boribid_guwewefetotewi_pevebatepawo_lamejufug.pdfIn PDF document text
    • http://files.chelseagilmoreart.com/uploads/1/3/1/4/131407138/3311643.pdfIn PDF document text
    • http://lijimeram.swintechtrw.net/uploads/1/3/2/7/132712207/3511021.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/1/0430/1075/2663/files/bayou_blue_upper_elementary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1929/0789/files/19004264432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/10266800988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8646/6210/files/hot_tools_professional_hair_dryer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3335/7209/files/bioseparation_science_and_engineering_harrison_free_download.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_off00004d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8E 5552 bytes
SHA-256: f4dc67cfb734eb0458fd7331a70afff50b539ae556f920c27d318d870c248159
font_01_sfnt_off00006047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6047 11060 bytes
SHA-256: 08e93dd1448cbddf11036db8bba83c37da7ba92972951b8254d214e461db2daa