Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9f1cfda5ce533c…

MALICIOUS

PDF

73.9 KB Created: 2021-03-23 14:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f3be52a810448ff00734b9318436b3 SHA-1: 8f04faa306319d72c88a89cc2927961da475b634 SHA-256: 8f9f1cfda5ce533c22ab09f5ec344f57979c143cb4c3c5938713297550364b2d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'spec sheet', likely intended to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://resalured.ru/123?utm_term=genie+z45%252F+25+spec+sheet
    • https://cdn.sqhk.co/dadirowuj/FQQgi43/golf_chipping_hitting_behind_ball.pdf
    • https://cdn.sqhk.co/leluforeref/ghOX5qb/cardi_b_noises_download.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_60130656214ed.pdf
    • https://cdn.sqhk.co/laxuweredex/HhegKij/15780655698.pdf
    • http://vopukisavenif.medianewsonline.com/atividades_de_alfabetizao_eja.pdf
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5ff42fce01f39.pdf
    • https://cdn.sqhk.co/ruwonumatag/hepww2v/jixiduwinuridutomem.pdf
    • https://cdn.sqhk.co/muligumixe/jcPaLhi/smash_mouth_concert_covid.pdf
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5ff0ac2c9446f.pdf
    • https://cdn.sqhk.co/zexukobesu/iiPShcm/proxima_centauri_coordinates.pdf
    • https://mufebomilizupa.weebly.com/uploads/1/3/4/6/134608191/kebasav-ribexififitowo.pdf
    • https://cdn.sqhk.co/dudugetogi/4YYGjdX/digicel_call_international_apk.pdf
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/moxados.pdf
    • https://cdn.sqhk.co/bexuxoxabim/WfPSjjj/kurotub.pdf
    • https://cdn-cms.f-static.net/uploads/4490263/normal_603ffa91da46d.pdf
    • http://kikifikoxije.mypressonline.com/15523054422.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dezinolabebosod.atwebpages.com/47734919933.pdf
    • https://uploads.strikinglycdn.com/files/e596647e-af07-4463-a3c3-3a209369066a/gifepakawigin.pdf
    • https://uploads.strikinglycdn.com/files/c2758aa2-7229-44b2-83a4-d7419ca7a623/23065360871.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e331.bin
b9d35e8d7daa2c36ddbee56b24c7bb29eb7054ffc2d3d07528fecf82cc469f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 5144 bytes
font_01_sfnt_off0000f4da.bin
8bde17e6c95e20a71bd6ea5fc4a79b98cc5875d9b82decb6e2df8b6600d415e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 11436 bytes