Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00792b6012bcd2e…

MALICIOUS

PDF

93.3 KB Created: 2021-03-10 17:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4cbbaf7fade067589aa9ecc0563dad1b SHA-1: ba8b7dd150b4ca24e3461a78fc4aa575b07f747c SHA-256: e00792b6012bcd2e5a600413baadd5453271cff6c69691e758cc45e10eadfa0a
186 Risk Score

Malware Insights

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

This PDF file is identified as a link farm, containing numerous external links to various websites. The primary purpose appears to be directing users to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://pelibifir.ru/aws?utm_term=ac+circuit+analysis+practice+problems PDF link annotation
    • https://cdn.sqhk.co/valujoper/j1JLhiK/chata_tatranska_strba.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/how_do_i_get_to_the_boot_menu_on_american_megatrends.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/lady_of_the_lake_movie_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/cghhibr/word_in_a_pics_norsk_level_1027_answer.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/a341c337-c57d-49a9-b6ee-a8809f0c83ff/jopevuzazulexobuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/42693811053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec45739-3176-4028-840b-00f3d492f2c9/oppositional_consciousness_methodology_of_the_oppressed.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/valumax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64aeebae-f492-4d48-b1f5-9e97cc161f6c/75715907752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f65592e-ca41-494d-b933-c19310574c96/70852658613.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_35cfd62f1de444aface27bbaa3d1b919.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/181bf490-672a-448e-8a47-3cf5eac2e7c9/14955802616.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_54c8f564a4834ab59e9567633707dad8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/131f49d6-4e39-482b-8598-9992c7b7a7d1/dutewugogakilikuletupiwem.pdfIn PDF document text
    • http://vebagakid.onlinewebshop.net/zuwebebutuguxapep.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_ec831b7c4f7c44dba4a6c51823480006.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/xafimadopipekotanirofilek.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/where_to_get_free_food_on_your_birthday_uk.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_d2ebe655ae814e04b0ee5faedd06c8ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/nababixudubuf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 5308 bytes
SHA-256: e766f475a467d70f960049d95a0d3ec019052b18e9e6811ffacf681bc8690500
font_01_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 11468 bytes
SHA-256: 7c5744466ed52b6aaa14f8273faf5df449805aea08e2924e14e6b03863777e06
font_02_sfnt_off000152a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A4 16072 bytes
SHA-256: ab6a2d92c6195441154fe03e3add47570783810922a3b82dfc3833ffb97f5f96

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