Malicious PDF — malware analysis report

Static analysis result for SHA-256 4915cfe5d6cd2ecb…

MALICIOUS

PDF

41.0 KB Created: 2020-09-30 12:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 5f8de7b102e3571a02f1122c145fe9e3 SHA-1: 619b5eb84be7e5cebed5b778606f17c982524456 SHA-256: 4915cfe5d6cd2ecb007e4a6669a99bc15e02824733205729e2d8012c17e97fa9
184 Risk Score

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://cctraff.ru/strik?keyword=common+acids+and+bases+pdf In PDF document text
    • http://pugojo.repaythis.com/uploads/1/3/1/6/131636725/zebikoluzudeda.pdfIn PDF document text
    • http://tononibif.momspantrykitchen.com/uploads/1/3/2/7/132740708/f850908a.pdfIn PDF document text
    • http://wutur.thinkglobalteachlocal.com/uploads/1/3/0/8/130873784/4539196.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/buxikegizukumadilodakofi.pdfIn PDF document text
    • http://dunoxukex.laverdasthoughtsandmemories.org/uploads/1/3/1/4/131438583/dbf149f8296.pdfIn PDF document text
    • http://kaweg.highlandtigers.com/uploads/1/3/0/9/130969723/7d1d742e9127c5b.pdfIn PDF document text
    • http://tiluwami.plateauvalleyanimalhospital.com/uploads/1/3/0/9/130969627/b893b.pdfIn PDF document text
    • http://files.rcdesignceramics.com/uploads/1/3/1/8/131871778/4517147.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/cb600489-d361-4425-ab8f-5f2b707a3442/18492586201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edc1a7b-eeae-4c18-be89-fc63b15f33cd/xukejagavebesijepapef.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_off0000639b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639B 5216 bytes
SHA-256: a174f2316947801ece932d7b41b14641083e4fd0220c32b35e830b4d7b417fea
font_01_sfnt_off0000753e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753E 9980 bytes
SHA-256: 0e7cc6a559745251e9c89685860a42d963dd558305e833431b0813a63ad5a416