Malicious PDF — malware analysis report

Static analysis result for SHA-256 899e2f1aeb1cc451…

MALICIOUS

PDF

77.1 KB Created: 2021-06-08 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 82035e15b4267121380aac818a2b96e3 SHA-1: 0980a0641be276d9175171e373294ef7efc14640 SHA-256: 899e2f1aeb1cc451623160cf95c1e642e5ede4f318548b91ad59c85a0731cb2c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://chcial.ru/wb?keyword=scotts%20riding%20lawn%20mower%2017hp%2042 PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4484632/normal_60b1f3080b09b.pdfIn PDF document text
    • https://jumabesabixoduz.weebly.com/uploads/1/3/4/3/134368642/lowilonoxoxoju_xujizifurip_ranewededokovil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_6030a5d367ea5.pdfIn PDF document text
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/365033.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/piwajerutolone_kikapovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6019592e0af56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5fd8931597f92.pdfIn PDF document text
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/mowufomoponawarufomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_60145a021b276.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/sumutevugoguzin.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/2698326.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/efde090c-6d0c-4766-ba05-670a795d95d5/how_to_steam_vegetables_with_a_colander.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cd786b-923a-4d12-b8b9-2733c81f0aee/what_is_human_geography_nature_and_scope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4b95e9-91c2-470a-b252-8c6116b17595/7603174122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a470f9ac-7b60-4dd4-a25c-7d979b167e18/2237972017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5946189a-d2b3-4427-879b-54c02ef44131/pusegipoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed20b4fc-48a9-4ac8-8446-3020a1fe5564/zoom_g5n_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a305cc7-a6cb-4eb1-8ede-1310000db4d0/fadipufitavizawopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba077e6-a158-45c8-815f-873f7f851d1f/ligul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443d6298-4005-4d80-b980-f2c0ec9194fe/dd_5e_dm_guide.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 6032 bytes
SHA-256: 351b9967080910bf812d4d212e9f145ae88d7f5d579231b971b705a83cfe6b12
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 10844 bytes
SHA-256: 3824d3755883cd03c2d71296a91b07db5db3cb8da9e1e09c994da3bed0a9e968