Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c9eabf9636dc34…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 00:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71ae3ed367b29d41fda13f6e8035904e SHA-1: 1c4759ebeb274ad59afbac2e549d046d3398b0d0 SHA-256: 55c9eabf9636dc340d6408f09f66b3262c6b476438d4912b5f9c91313d7e831f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/2150412.pdf In PDF document text
    • http://creditactive.info/68803608587ckt47.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/d333a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5ffb988f2d530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_6024c360beb66.pdfIn PDF document text
    • http://sehq.xyz/detail_five_layers_of_tcp_ip_protocol_stackxvxii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_60410d37282cd.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/jgjcigB/video_viral_2018_di_facebook.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/d2d3bdca34c47.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/Bi9iigE/figimunuzobomupas.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/nFSsCia/griswold_christmas_village_house.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5ffb75447919e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_5fe63411e8a2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_601aba51131ac.pdfIn PDF document text
    • http://dlkmvkoenv.info/dovulizubln3x9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_5fda32e651c0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fef6253f0882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_60485a9cf142b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fecf1d95e25f.pdfIn PDF document text
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/1405862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=lyrical%20dance%20movesPDF link annotation
    • https://uploads.strikinglycdn.com/files/d4962d2d-c3eb-44e3-a298-1951f7185240/bow_tie_pasta_salad_with_italian_dressing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1e9025-e7b6-4f29-92da-19a8f581bcde/brene_brown_power_of_vulnerability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9bf7c8b-6bf8-42b3-918d-e55aa77b8110/oxford_physical_science_grade_10_textbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144572d3-9ae6-425d-bbae-f373986cfb5b/stock_options_for_beginners_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813b9d68-2530-427a-83ad-580d19bb3427/57453460360.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_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 5188 bytes
SHA-256: 3a3f5d8bfa578f424011204018e16bf65b96644ea0ecefc1a2099b6bdfba972d
font_01_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 11060 bytes
SHA-256: 3a78bbb7fe7d610f08bbf84af5b3fccf65f3a8487d303498c150027c8076fefd