Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16cfa03728b55d2…

MALICIOUS

PDF

69.7 KB Created: 2021-01-13 15:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5403578283b04ed066c0ef6fd77faf50 SHA-1: 41491ec89e54541c98625da7855fa2370a5d531a SHA-256: c16cfa03728b55d20efa29c2a2d394e91aa0e87b28b431f978a6df6c576d33ca
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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/aws?utm_term=answer+key+jump+math+8.+1 In PDF document text
    • https://somizinizerolu.weebly.com/uploads/1/3/0/8/130873918/xikosuriwek_wegorosowavazoj_vamivik_biwebabuxilotup.pdfIn PDF document text
    • https://site-1168358.mozfiles.com/files/1168358/daddy_long_legs_game_hack.pdfIn PDF document text
    • https://daginunus.weebly.com/uploads/1/3/4/5/134597638/wapediwag.pdfIn PDF document text
    • https://site-1177689.mozfiles.com/files/1177689/56266012389.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/xebilawokefagajiligajamor.pdfIn PDF document text
    • https://site-1174558.mozfiles.com/files/1174558/xuwegetukanafexag.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jjegih9/dutiwuxupofejub.pdfIn PDF document text
    • https://zetidikusas.weebly.com/uploads/1/3/4/7/134740093/5971151.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/3OE9ihh/vokoravasunabulaxobax.pdfIn PDF document text
    • https://site-1166671.mozfiles.com/files/1166671/16474138395.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/b039712f4.pdfIn PDF document text
    • https://site-1168145.mozfiles.com/files/1168145/nebipuwite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/brother_dcp_t310_driver_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/pufikudovaxufureduwotasiv.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/tevovanisuvakadabe.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_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 5628 bytes
SHA-256: 686ff09855b7ab73a307b44016dbce3c922e23fff8d6fc0e3dc7e377412e9108
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10588 bytes
SHA-256: b0a63d02f4da3b7da6af0c678eae189ec20221bcd63181c9b204faa18da72852