Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef8b8e8cb4a707c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-25 15:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e182783413bd04b81d11c1f9d777855 SHA-1: 5b3cf48c0ba4559fe12bab5e357826ae82aa0502 SHA-256: 3ef8b8e8cb4a707cdcf304816490b5095c2bd761c0b1b7110772fbf13702fecd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=original+tire+size+for+2007+chevy+impala PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fe0da35e55e5.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/6165238.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/winalelofifipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_6010c45b3af2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fe142257a11f.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/loroloparusabo_sijavalume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_602ac5935b2a6.pdfIn PDF document text
    • http://wivafojoki.22web.org/score_match_android_gameplay.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/6949900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_60068d7c29d92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegigija.atwebpages.com/rokawanavopunupeboj.pdfIn PDF document text
    • http://pasoxivetigo.epizy.com/diagramas_de_clases_uml_ejercicios_resueltos.pdfIn PDF document text
    • http://zezunas.epizy.com/hd_wallpapers_1920x1080_for_mobile.pdfIn PDF document text
    • http://kitasiru.epizy.com/effective_business_writing_skills.pdfIn PDF document text
    • http://zajepatexesa.epizy.com/25290131012.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/genie_intellicode_learn_button_location.pdfIn PDF document text
    • http://badiwoxot.rf.gd/toefl_structure_sample_test.pdfIn PDF document text
    • http://nesitobika.rf.gd/26815881064.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 6024 bytes
SHA-256: 4a3b9ee23c7bc7a2aec3fc1ecfad843a5a141e9335f514ebbe924d33bf698526
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 10280 bytes
SHA-256: af95ab0820ddfc2a72f90d0f9f96c1734c1150e004b3153c5ea3a09bb8337ddf