Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb118765feafa4a6…

MALICIOUS

PDF

73.8 KB Created: 2021-03-07 18:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4830d73845a6ad725bbb2a02066bce50 SHA-1: e9a9537d976dbba1b3e3e5406d88e7626a6cea69 SHA-256: cb118765feafa4a630fba3cf53c6a564e4e2f090c4210ea37a757c08549cac05
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/award?keyword=matlab+function+return+array PDF link annotation
    • http://japancar-sib.ru/318080639256juz2.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/peputigome_pevun_renolurubivefo.pdfIn PDF document text
    • http://reduslim-officialsite.site/73053269669zjpuw.pdfIn PDF document text
    • https://dikufakeg.weebly.com/uploads/1/3/5/3/135348043/nivefip_womosawob_kaboburazo.pdfIn PDF document text
    • https://kerusovaxi.weebly.com/uploads/1/3/5/9/135978613/4341245.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/bugupoborugadapi.pdfIn PDF document text
    • http://test123test.xyz/54970054444b26u0.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/gafutagikufikugetumat.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/764d0276afe4ac.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/a8dc0.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/56550ece-bf8b-4cdd-8391-cffe7a7ec7c7/is_hansel_and_gretel_2013_on_netflix.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/49395912548.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_e282efa98e534e7491c285e40a2fb472.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a6b719-d9d9-46c7-92a7-da45fa78a15f/boston_market_thanksgiving_dinner_cost_2020.pdfIn PDF document text
    • http://wozadubokurego.epizy.com/xozarigedupef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd229b2-04c2-43dd-8e22-23197eeced87/fedorowulez.pdfIn PDF document text
    • http://bozalusi.epizy.com/what_will_you_do_upon_entering_the_room.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_d3e095d6e2404c6095bfa7904ace0fd2.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_dfccffec6da8452382589a2a7d7054c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afa4bb7-510e-4189-bcd1-f67d2cd249c7/muxidorowenimowaj.pdfIn PDF document text
    • http://mafodif.epizy.com/xosezovirapekib.pdfIn PDF document text
    • http://wafitiw.epizy.com/guardian_angel_songs_mp4.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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 4944 bytes
SHA-256: 83e9504cde58f14ed2c138fa6fc3ba3a78cc3655700a1e5126fce3c1d327faaa
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 14776 bytes
SHA-256: 4f8626db9c7de154e69dbeb5da5166266f61fec6b46d23f53d9e911330d8d2fa