Malicious PDF — malware analysis report

Static analysis result for SHA-256 50220c1b91a65ae5…

MALICIOUS

PDF

92.2 KB Created: 2021-03-21 02:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cb188d8f4d8e5aced03f455e1170fb2d SHA-1: 26cbeac2d7ddc812b10b00ade9e87bf2417c5b71 SHA-256: 50220c1b91a65ae5be21ea5a13a00208d3aeb324a3e512910c220c6296281ad3
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 contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The embedded URLs and the PDF's structure are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=eric+barker+barking+up+the+wrong+tree+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415534/normal_601f6f914771d.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/govosajosawinoxa.pdfIn PDF document text
    • http://tomandbxof.site/how_do_i_get_1.1_numbering_in_wordg9oey.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/dujareraguzawakenaw.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/memabuze.pdfIn PDF document text
    • http://dressnbuy.com/kobaxuvojaduniwopanazesbrfl.pdfIn PDF document text
    • http://ita-talia.fun/basics_of_aerothermodynamicsi7d1d.pdfIn PDF document text
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/8929770.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/877290ccdc3777a.pdfIn PDF document text
    • http://theandyhong.com/yamla_pagla_deewana_2_video_songjli9v.pdfIn PDF document text
    • https://futisukafasuku.weebly.com/uploads/1/3/5/3/135345320/6514030.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/captain_america_first_avenger_movie_filmyzilla.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_60074d280a2f9.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/477ef870ce254.pdfIn PDF document text
    • http://runolive.com/awacs_awards_full_formfevwr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_dd591183e2b9421f90bcfcede13cd90f.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_a0e3705bf5134df3bdf83f023a55f42d.pdf?index=trueIn PDF document text
    • http://tutivute.epizy.com/asexual_reproduction_in_angiosperms.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_48ce41250b9748e2a888c824ed4ee39e.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_2c260e3b58f94ac39ab1ffc6fcad6b05.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_7265b2b3a47446c4b17adb0ba73f5b7d.pdf?index=trueIn 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_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 5460 bytes
SHA-256: c1bfcd2c3366779f32991da956d8e017123889dea903129cd9f26f02d6d3d8f5
font_01_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 16152 bytes
SHA-256: 319beb2f08734d179ae5209da0e0c38e4ee13c98129a3d0324d7c01615642946