Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82e5d503cdaa280…

MALICIOUS

PDF

57.7 KB Created: 2020-10-01 22:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 82649bada412b066a8e2b38de9dd1121 SHA-1: b724b48ff8c19badace42d9fb0237b5890304682 SHA-256: a82e5d503cdaa2808428d49bd8af3c158e123786a5f22582b53f04669d5ce1a7
164 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=balasore+map+pdf In PDF document text
    • https://site-1036661.mozfiles.com/files/1036661/tikajivorujemepine.pdfIn PDF document text
    • https://site-1036981.mozfiles.com/files/1036981/96153676575.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/84241010684.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/vesinudi.pdfIn PDF document text
    • https://site-1037854.mozfiles.com/files/1037854/46318766270.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/55795285707.pdfIn PDF document text
    • https://site-1036873.mozfiles.com/files/1036873/82404886651.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/69438807699.pdfIn PDF document text
    • http://musuki.freipropertymanagement.com/uploads/1/3/0/8/130814526/fugiwozekumavivoro.pdfIn PDF document text
    • http://files.katieanastas.com/uploads/1/3/1/3/131383333/5730533.pdfIn PDF document text
    • http://zolulif.tplsongwriting.org/uploads/1/3/1/3/131379326/76870f.pdfIn PDF document text
    • http://bifazan.bancroftcenterofchinesemedicine.com/uploads/1/3/0/7/130740051/9043120.pdfIn PDF document text
    • http://files.mrmacbiblebook1.com/uploads/1/3/1/8/131856244/9492865.pdfIn PDF document text
    • http://files.missionbeachaustralia.com/uploads/1/3/1/3/131380767/fuxusibilume.pdfIn PDF document text
    • http://wipalo.thriveflinthills.com/uploads/1/3/1/3/131398404/7900712.pdfIn PDF document text
    • http://zewabovu.quicktowingllc.com/uploads/1/3/0/9/130969954/9653617.pdfIn PDF document text
    • http://files.thewhisperingwild.co.uk/uploads/1/3/0/7/130740262/lopetexape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000962a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x962A 5236 bytes
SHA-256: 605d6c7473b04f74b4029a6a5ef408b88608ae06b43242604a38e809d54f3087
font_01_sfnt_off0000a7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E1 16584 bytes
SHA-256: 68fdc59060c26ce9c581154a60462a09b3007d767969b542f58e8dd0d06b83bd

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