Malicious PDF — malware analysis report

Static analysis result for SHA-256 df23582b185d4f65…

MALICIOUS

PDF

79.4 KB Created: 2020-10-25 19:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3c1c32807216cd9fe12e93c215104c85 SHA-1: 62d06e886d9d5e9aff190d6ee316f98a304376d5 SHA-256: df23582b185d4f65ff28557e897e084a31aba2bb62ce093b96e80fd3df9375dd
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'digestive system pdf anatomy'. The presence of numerous external links, many hosted on disposable domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ttraff.link/pify?keyword=digestive+system+pdf+anatomy In PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/pewiredegaka.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/gosaruwemox-nitorananetad-vimolitav-waruxupe.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/dulovelaxetufiz.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/3980624.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/bbb9cb4a.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/zidebesirolabavo.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/5032723.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/palutami_xavutonadup_benapobalinit.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/narazumiz-lajidopixorul.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/565ab671edbbf.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/detusesusixer.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/9859675.pdfIn PDF document text
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/3692261.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/9421603.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/d8195d4984dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/435b8b35-99bf-4c73-877f-f30ae31e4ee8/ejercicios_de_las_vocales_para_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4efcdb0-2b96-456d-bbd5-911c3e583a6f/tujuraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda5a8b7-8a54-4aa8-9a55-ab8da7ae6702/26359299517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee25527-4a99-4560-b5b0-c08b4ffea915/regapegawenojudogukoxel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb930397-7d16-4b00-b852-082ba0d812e8/94038534910.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/55667697630.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/shack_hartmann_wavefront_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/fusionner_deux_adobe_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/dutigamukiwikidek.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 5392 bytes
SHA-256: 80275317ed258f51f02ac35037b26ace7011163d38f0a5cb828927347b8ef776
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10916 bytes
SHA-256: c86eedce36aff69c9a33e5e521a1959ad991f58f1f7a6b4a1d970072d74fac94