Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b75bf21a2f61053…

MALICIOUS

PDF

79.0 KB Created: 2021-02-05 12:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1823fb5661ef1af6090c82f8a2ce3f06 SHA-1: 8a85027597db48ed3cffa9ced6e170b680de8619 SHA-256: 1b75bf21a2f61053a8ceeb7bc28cd29935d8ec9267b3697958c2310836da6d3a
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/wb?keyword=2015%20dodge%20challenger%20hellcat%20manual In PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/6d4d33fe6b17.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/fixaluxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60149f331db0f.pdfIn PDF document text
    • http://maxufadewodov.22web.org/bsg_guidelines_ibd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470211/normal_5fe571e085101.pdfIn PDF document text
    • http://amorexpo.com/eneida_de_moraes_obrashtwuc.pdfIn PDF document text
    • https://fajupumivut.weebly.com/uploads/1/3/4/1/134108914/54250f6cf.pdfIn PDF document text
    • https://mexekujiwununiv.weebly.com/uploads/1/3/1/4/131407761/14ee2.pdfIn PDF document text
    • http://wazixusazajafem.22web.org/63124278364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_5fe850670430c.pdfIn PDF document text
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/wemukodudolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misugivunuzu.epizy.com/arikil_pathiye_song_wapmallu.pdfIn PDF document text
    • http://vejajideb.epizy.com/churchill_show_latest_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/aplikasi_al_quran_indonesia_pc.pdfIn PDF document text
    • http://piwunutid.epizy.com/cacfp_infant_meal_pattern_forms.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_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 5528 bytes
SHA-256: d3dfbf5f81a7e9055c2024490fa9b5110792c7ca84a849f2849a59eb4130f5ba
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 11812 bytes
SHA-256: fc58d6bd3f99829dcf03f90669b6fc30640673e54a930695dd0ade797a92d05d