Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8edcd64c5d165e…

MALICIOUS

PDF

78.3 KB Created: 2021-03-05 17:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6a40a74479fee820ff431b164f1d802 SHA-1: 073b20e1155055977bbe26633502b6df44401efb SHA-256: 3c8edcd64c5d165e6afbfc0223424187e3e4d0c4ee88dfbfcc9e6e2c52323943
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites under the guise of information about earthquake-resistant buildings. The heuristic firings indicate a high likelihood of malicious intent, with specific detection by ClamAV as a phishing trojan. The embedded URLs are designed to lead users to potentially malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=why+do+some+buildings+fall+down+during+earthquakes PDF link annotation
    • https://tojawejememu.weebly.com/uploads/1/3/2/6/132682640/e76c37fce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_60282690d0057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_601a1bf3272c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_6025519b50b0d.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/piwarajavuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382619/normal_5ffc49ccad821.pdfIn PDF document text
    • http://fito4ka.xyz/wapofilir7nrtn.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/40_hadith_on_seeking_knowledge_in_urdu.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/263a972d72e1.pdfIn PDF document text
    • http://pollsexpert.com/59505944210ogloq.pdfIn PDF document text
    • http://erogan-encolumbia.site/characteristics_of_report_writing_in_business_communicationklv3e.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/dean_koontz_movie_intensity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_c7384475a3794b45ad34d54a20c6b1d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa029f7-6d6d-434b-a076-8d6aaf6ddc5e/mevizowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6473d73-7602-49d8-8b14-21f918bdd455/mona_lisa_overdrive_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06062dae-df4f-4822-b61d-a40b35141b24/how_to_factory_reset_iphone_5c_locked_without_computer.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_a2f65aa25f2049338e7bb2befc1e9d00.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_32c4f5afabc24d73aace18b765992f40.pdf?index=trueIn PDF document text
    • http://kepawomokatuke.myartsonline.com/autocad_2007_tutorial_for_beginners_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 5740 bytes
SHA-256: 666f98a3e2fab78893c4c87fd28dd5adb5b3139c935de5ad82550b749faf6f9f
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 10364 bytes
SHA-256: 787fa42f7d1056c60e06f20f180cdbb112cf3b2574cab4bec56aa5a6011e1198
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230