Malicious PDF — malware analysis report

Static analysis result for SHA-256 be10c7ef5cdbf786…

MALICIOUS

PDF

82.5 KB Created: 2021-03-17 19:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 54d384737e5e988962338ae7131ffcdd SHA-1: 5626944a5b4dfca3cd282dd85658c331955afad0 SHA-256: be10c7ef5cdbf786bb3c49c7cf80c805163742ed01dab791bad1a2dc2c23cb41
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a social engineering attack to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/award?keyword=egyptian+art+pdf PDF link annotation
    • https://vimedijo.weebly.com/uploads/1/3/1/6/131606629/lulabanofipe.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/2363307.pdfIn PDF document text
    • http://sodalabs.club/87588378926gano4.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/4aCibhh/sapov.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/9080135.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzirixowev/nhagegd/colors_that_go_with_red_and_black_plaid.pdfIn PDF document text
    • http://soldonlakewood.com/2689929531084mtw.pdfIn PDF document text
    • https://cdn.sqhk.co/kubibosujiko/hhgigdd/62774312289.pdfIn PDF document text
    • http://latuha.com/xitojunozoledogixadizuvi2q8d8.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://uploads.strikinglycdn.com/files/53170aa1-a195-4ca2-953c-b7c6e72c344c/how_to_open_craftsman_garage_door_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3536bea4-71ac-4c79-bf94-a6ae514ff5a7/pl_sql_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883e1e88-6dec-46f4-9c0f-68c5556ab3fc/bewufawovujafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b7e17c-45bf-4bd5-970f-7c325dc523f0/manual_de_funciones_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a78723-644a-499a-adc6-563268ceb31a/rekomom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e8ff6e-3deb-4f98-a3f5-79a9ffaa0eea/how_to_troubleshoot_zoom_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279f9a44-3c06-4fe7-986c-0a614c5dc640/what_is_another_word_for_least.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45af7843-ae5c-4e9a-aeb8-b27977ea2c74/annie_script_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24a7490-bc4e-4efb-b739-ebe2c6294233/is_there_an_official_samsung_tv_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2400fed-acc8-4565-830b-eb94f7cb3c1d/royal_210dx_cash_register_ink_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77961fb-a9fa-45e4-aa44-c4d5cdfd44b1/childrens_books_for_learning_english_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a923162e-3b60-446e-b490-5b9bc2c297fa/bufemugimavumojelopapegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b2e172-a854-43e3-ba0f-b83f14709855/2552603484.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_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 4616 bytes
SHA-256: 7058f2aafcd21d00d94b4275ba45efed568f9e615679cc0a6ac4fe3ab6dc7515
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 11092 bytes
SHA-256: 4a046ec79b599514c7e248f38bfe1b5cebe9dcd90ef20ef4217c18adc8fdd85a
font_02_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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