Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc6eabe2c41af9b…

MALICIOUS

PDF

83.7 KB Created: 2021-06-06 08:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 220e6f36db93d0035e36feb7b3712e53 SHA-1: 493c31174fb2ed551590b9b5753a7ab94f790872 SHA-256: ecc6eabe2c41af9ba3d4dabe0b8059115cbb0ad9d3e07a8d9ba6ef4af11b127e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with one prominent example being 'https://maypoin.ru/123?utm_term=aluminum+plain+sheet+philippines'. The presence of many links on disposable hosting suggests an attempt to manipulate search engine results or direct users to phishing sites. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://maypoin.ru/123?utm_term=aluminum+plain+sheet+philippines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474978/normal_6031367247193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_601ec4f56542f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_6024caef37a01.pdfIn PDF document text
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/a56f560e69b22bb.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/cc3ad0520213f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_6021a069a5586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_604018d1d93d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fd3417841612.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/bcbb623e8e733ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadb2f89-109c-420d-803c-87ffc8c37ab0/treat_group_c_strep_pharyngitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07671b3b-1dfa-42b7-95e1-c91fbd1b6ed2/zixitefekaxifedifevojeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d092a75f-bba1-4439-80f2-82fffa0029a6/mysql_tutorial_for_beginners_mosh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e8fa98-524c-436b-8bcf-df98718cf296/sosawazanewugumijazel.pdfIn PDF document text
    • http://metudebebi.pbworks.com/f/sonapip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4a35e4-a0b3-45e4-b3e7-02e3795b1c8d/how_do_you_reset_a_dewalt_20v_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce4b4ea-a1c2-4821-a8c2-c47f4bafeff6/xadarolopefotawug.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144688575/graco_duet_swing_cover.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144411648/butterfly_knife_part_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b80888-77cf-474b-965f-4cc046d2fab1/39559485652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d649184b-8b7f-4c88-912f-aed0428842c7/nufotexulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d840a84-771c-4f69-845f-eeb9f60396dd/e02_error_code_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3001fda8-909b-4812-a242-0050bc408fd8/70577666905.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_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 4952 bytes
SHA-256: 6c649b964aca55e946e04c2b11055a699bb3fb0d2c1933344d341eca55e6f497
font_01_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 12340 bytes
SHA-256: b431468b6a37c5022b4bc5be057693ddb0444baf80ea616fe458ae670ec19f22