Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cb0523b295cdd2…

MALICIOUS

PDF

69.7 KB Created: 2021-04-09 23:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c83877b1e4b8215250eab40ae329d2e1 SHA-1: 72f06152e068fea9ca5b89b60caca9e41455e730 SHA-256: 11cb0523b295cdd202492d65450fb17ba31bbddbe9bdaa5eadb57c7648e77197
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a free PDF download, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://yafferge.ru/strik?utm_term=el+lenguaje+secreto+de+tu+cuerpo+pdf+gratis In PDF document text
    • http://floradoma.net/how_to_fall_asleep_with_insomnia_at_a_young_agei82fy.pdfIn PDF document text
    • http://ellmax-site.xyz/logitech_harmony_300_driveropf7r.pdfIn PDF document text
    • http://potenciy.xyz/dikisodivuwejaxedoxatuwazlgoof.pdfIn PDF document text
    • http://daating19.site/41803993499rzdm5.pdfIn PDF document text
    • http://fridgeservice.ru/21984560287wk0ug.pdfIn PDF document text
    • http://idealicaufficiale.website/how_to_reset_mini_smart_plug7axjc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_2c396e6aecba4885b2c4af74f214e2f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/ffxiv_leveling_guide_30-_40.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_6c49e43a695f454d91e69ad21ca3041f.pdf?index=trueIn PDF document text
    • http://pijularof.epizy.com/49901324696.pdfIn PDF document text
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_dcd39e3921174ad78b6e1665f8cc32f0.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_dc042ca5a7a648deb3ad0feb30ff503d.pdf?index=trueIn PDF document text
    • http://suzurexitumafod.epizy.com/zetiraguxot.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_dbaedf23f585418bbe2cfb92d728fc42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/62336380939.pdfIn PDF document text
    • http://mofemofosaxi.rf.gd/do_bulova_watches_have_batteries.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_a6cc289fed074ec3af05525726f3e04e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/what_size_battery_for_murray_riding_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/defence_grid_2_achievement_guide.pdfIn PDF document text
    • http://tunowik.epizy.com/beats_by_dre_pro_headphones_case.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/ganapudukepekibegosub.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_7b40fa151e9646b3b1a129b2c8f163d9.pdf?index=trueIn PDF document text
    • http://mijumepalus.rf.gd/sivirodaziwirov.pdfIn 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5356 bytes
SHA-256: 04b9e3cd0e60163a34c446e01a3a629926dea7c82f8ac12c49bc155fb278a6bd
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 11604 bytes
SHA-256: e0c04f4cd86804e2b1172268a1785f61ce9b837a4fae6cd853e342d0da228afe